Crossword Genius

Acid in proteins (5)

Ross

I believe the answer is:

amino

'acid in proteins' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for amino that I've seen before include "(Protein constituent) acid" , "Minor insult; slim" , "Acid found in proteins" , "sort of acid?" , "- - acids" .)

I've seen this clue in the Sydney Morning Herald and the King Feature Syndicate.
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