Hands-up time? (4)
I believe the answer is:
noon
'hands-up time?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for noon that I've seen before include "A moment of time" , "Twelve during daylight" , "when PM starts" , "when only mad dogs go out?" , "Twelve o'clock, midday" .)