Crossword Genius

Good and bad quantity of drink (4)

Ross

I believe the answer is:

gill

'quantity of drink' is the definition.
(a gill is a quarter of a pint)

'good and bad' is the wordplay.
'good' becomes 'g' (abbreviation).
'and' means one lot of letters go next to another.
'bad' becomes 'ill' (similar in meaning).
'g'+'ill'='GILL'

(Other definitions for gill that I've seen before include "Respiratory organ of fish" , "A little drink" , "ravine" , "Organ for breathing under water" , "Small liquid measure" .)

I've seen this clue in The Guardian.
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