Time to return from North Copenhagen (5)
I believe the answer is:
epoch
'time' is the definition.
(epoch is a kind of time)
'return from north copenhagen' is the wordplay.
'return' says the letters should be written in reverse.
'from' says the answer is hidden in the clue.
'hcope' is hidden within 'north copenhagen'.
'hcope' backwards is 'EPOCH'.
'to' acts as a link.
(Other definitions for epoch that I've seen before include "Period of time in history" , "Point in time fixed by some great event" , "remarkable time" , "Geological time period" , "Unit of geological time" .)