Question the time (4)
I believe the answer is:
when
This clue is a double definition.
'question' is the first definition.
'time' is the second definition.
(I know that time can be written as when)
'the' is the link.
(Other definitions for when that I've seen before include "At what time?" , "As soon as" , "stop pouring the drink" , "Say it when you''ve had enough" , "Over what period?" .)