Definitions from Wiktionary ( )

▸ adjective:  (physical) Free of dirt or impurities.
▸ adjective:  Not dirty, filthy, or soiled.
▸ adjective:  In an unmarked condition.
▸ adjective:  (aerodynamics) Allowing an uninterrupted flow over surfaces, without protrusions such as racks or landing gear.
▸ adjective:  (aviation) Having the undercarriage and flaps in the up position.
▸ adjective:  Empty.
▸ adjective:  (of metal) Having relatively few impurities.
▸ adjective:  (behavioral) Free of immorality or criminality.
▸ adjective:  Pure, especially morally or religiously.
▸ adjective:  Not having used drugs or alcohol.
▸ adjective:  (of criminal, driving, etc. records) Without restrictions or penalties, or someone having such a record.
▸ adjective:  (informal) Not in possession of weapons or contraband such as drugs.
▸ adjective:  (informal) Devoid of profanity.
▸ adjective:  Smooth, exact, and performed well.
▸ adjective:  (obsolete) Total; utter. (still in "clean sweep")
▸ adjective:  (informal) Cool or neat.
▸ adjective:  (health, of a person) Free of infection or disease.
▸ adjective:  (health) Devoid of sexually transmitted diseases (STDs).
▸ adjective:  That does not damage the environment.
▸ adjective:  Free from that which is useless or injurious; without defects.
▸ adjective:  Free from restraint or neglect; complete; entire.
▸ adjective:  Well-proportioned; shapely.
▸ adjective:  (climbing, of a route) Ascended without falling.
▸ adjective:  (professional wrestling slang) Of a victory or performance: without any submission holds, disqualification, interference, etc.
▸ noun:  Removal of dirt.
▸ noun:  (weightlifting) The first part of the event clean and jerk in which the weight is brought from the ground to the shoulders.
▸ noun:  (in the plural, metal music) Clear vocals, contrasted with death growls and screams.
▸ verb:  (transitive) To remove dirt from a place or object.
▸ verb:  (transitive) To tidy up, make a place neat.
▸ verb:  (transitive, climbing) To remove equipment from a climbing route after it was previously lead climbed.
▸ verb:  (intransitive) To make things clean in general.
▸ verb:  (transitive, computing) To remove unnecessary files, etc. from (a directory, etc.).
▸ verb:  (intransitive, curling) To brush the ice lightly in front of a moving rock to remove any debris and ensure a correct line; less vigorous than a sweep.
▸ verb:  (manga fandom slang) To purge a raw of any blemishes caused by the scanning process such as brown tinting and poor color contrast.
▸ verb:  (video games) Synonym of clean up
▸ verb:  To remove guts and/or scales of a butchered animal.
▸ adverb:  Fully and completely.
▸ noun:  A surname.

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