"Fake it 'til you make it" or "No pain, no gain" (5)

I believe the answer is:

motto

(Other definitions for motto that I've seen before include "Catchcry, slogan" , "Phrase to express character" , "Maxim; slogan" , "Short sentence expressing an ideal" , "Saying; slogan" .)

I've seen this clue in The New York Times.

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