Crossword Genius

Fixed unnatural grin (6)

Ross

I believe the answer is:

rictus

(Other definitions for rictus that I've seen before include "A gaping grin or grimace" , "A fixed gaping grin" , "Death grin or sustained gaping" , "Rustic (anag) -- gaping grimace" , "Fixed grimace or grin" .)

I've seen this clue in The Times.
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