Crossword Genius

Fixed unnatural smile (6)

Ross

I believe the answer is:

rictus

(Other definitions for rictus that I've seen before include "Gape of open mouth" , "Fixed grimace, in horror" , "Death grin or sustained gaping" , "Fixed grimace or grin" , "A fixed gaping grin" .)

I've seen this clue in The Guardian.
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