We found one dictionary that defines the word overclutter:

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1. overclutter: Wiktionary

Definitions from Wiktionary (overclutter) ▸ verb:  To clutter to an undesirable extent. ▸ Words similar to overclutter ▸ Usage examples for overclutter ▸ Idioms related to overclutter ▸ Wikipedia articles (New!) ▸ Words that often appear near overclutter ▸ Rhymes of overclutter ▸ Invented words related to overclutter