Period in camp has ended (5)
I believe the answer is:
phase
'period' is the definition.
(I know that phase is a type of period)
'in camp has ended' is the wordplay.
'in' says the answer is hidden in the clue.
'PHASE' is hidden in the letters of 'camp has ended'.
(Other definitions for phase that I've seen before include "Shape (anag.)" , "Distinct period in development" , "Any distinct time period" , "Aspect of moon" , "Period within process" .)