Crossword Genius

A question of time (4)

Ross

I believe the answer is:

when

This clue is a double definition.

'a question' is the first definition.
(when is a question word)

'time' is the second definition.
(I've seen this before)

'of' is the link.

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

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