Crossword Genius

Turned up rather pleased, showing part of a smile (4)

Ross

I believe the answer is:

gums

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If this is the answer I cannot explain how the clue works.

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(Other definitions for gums that I've seen before include "Trees" , "Smug around the mouth" , "Teeth are set in them" , "Glues" .)

I've seen this clue in The Independent.
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