Crossword Genius

Spoil drink? That's the limit! (6)

Ross

I believe the answer is:

margin

'the limit' is the definition.
(thesaurus)

'spoil drink?' is the wordplay.
'spoil' becomes 'mar' (synonyms).
'drink?' becomes 'gin' (gin is an alcoholic drink).
'mar'+'gin'='MARGIN'

'that's' acts as a link.

(Other definitions for margin that I've seen before include "Blank space around the edge" , "bank" , "Edge, border, fringe" , "Border or leeway" , "Blank space around a text" .)

I've seen this clue in The Times and The Sun.
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