Crossword Genius

Whisky drinkers may say it is just a question of time (4)

Ross

I believe the answer is:

when

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'question of time' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

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(Other definitions for when that I've seen before include "As soon as" , "Say it when you''ve had enough" , "Over what period?" , "At what time?" , "stop pouring the drink" .)

I've seen this clue in The Irish News and The Globe and Mail.
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