Crossword Genius

Whisky served in this way may be ruined? (2,3,5)

Ross

I believe the answer is:

on the rocks

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'be ruined?' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for on the rocks that I've seen before include "Having problems" , "In difficulties" , "Ruined" , "Served neat with ice" , "In trouble and failing" .)

I've seen this clue in The Times.
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