Time to return, if you like (4)
I believe the answer is:
noon
'time' is the definition.
(noon is a kind of time)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for noon that I've seen before include "when PM starts" , "[LUNCHTIME] ?" , "Twelve o'clock, midday" , "A moment of time" , "Twelve during daylight" .)