Sorry, no online dictionaries contain the exact phrase not in the mainstream.
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Reverse dictionary results:
1. alternative
 2. fringe
3. unconventional
4. nonconformist
5. countercultural
6. semipro
7. deceptively
8. heteroclite
9. semiprofessional
10. antinatural
 11. asocial
12. beatnik
13. nonrealistic
14. pro-am
15. deviant
16. dilettant
17. eccentric
18. maverick
19. objective
20. pseudointellectual
 21. strange
22. unrealism
23. abnormal
24. abstract
25. alternative lifestyle
26. amateur
27. anomaly
28. dilettanteish
29. entity
30. extrajudicially
 31. fringy
32. impressionistic
33. irrealis
34. luftmensch
35. offbeat
36. twilight zone
37. aberrant
38. aberrated
39. aberrational
40. abnormalcy

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You can look up the words in the phrase individually using these links:   not ?   in ?   the ?   mainstream ?
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