Crossword Genius

Lip-plumping injection (6)

Ross

I believe the answer is:

filler

(Other definitions for filler that I've seen before include "Something used in cracks and cavities" , "Wall repair paste" , "A makeweight" , "Something put into gap" , "Refill with material used to stuff a cavity" .)

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