Corps in map upset: a lot of time spent here? (6,4)
I believe the answer is:
prison camp
'a lot of time spent here?' is the definition.
(place where prisoners do 'time')
'corps in map upset' is the wordplay.
'upset' indicates an anagram.
'corps'+'in'+'map'='corpsinmap'
'corpsinmap' with letters rearranged gives 'PRISON CAMP'.
(Other definitions for prison camp that I've seen before include "gulag" , "Stalag perhaps" .)