Caught? Then long time in prison! (4)
I believe the answer is:
cage
'prison' is the definition.
(I've seen this before)
'caught? then long time' is the wordplay.
'caught?' becomes 'c' (cricket abbreviation).
'then' is a charade indicator (letters next to each other).
'long time' becomes 'age' ('age' can be a synonym of 'long time'**).
'c'+'age'='CAGE'
'in' acts as a link.
(Other definitions for cage that I've seen before include "US composer -- barred enclosure" , "In places squirrel's nest" , "US avant-garde composer, d. 1992" , "Confine behind bars" , "Place of confinement" .)