Crossword Genius

Acid makes expert twitch (6)

Ross

I believe the answer is:

acetic

'acid' is the definition.
(acetic acid is a kind of acid)

'expert twitch' is the wordplay.
'expert' becomes 'ace' (ace can informally mean very good).
'twitch' becomes 'tic' (tic is a kind of twitch).
'ace'+'tic'='ACETIC'

'makes' acts as a link.

(Other definitions for acetic that I've seen before include "Colourless pungent acid" , "Type of acid derived from vinegar" , "Like vinegar's acid" , "Saucy'" , "tart" .)

I've seen this clue in The Mirror.
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