Is in a porn production; gets jail (6)
I believe the answer is:
prison
'jail' is the definition.
(I know that jail can be written as prison)
'is in a porn production' is the wordplay.
'in' means one lot of letters goes inside another.
'production' is an anagram indicator.
'porn' anagrammed gives 'pron'.
'is' going within 'pron' is 'PRISON'.
'gets' acts as a link.
(Other definitions for prison that I've seen before include "Cooler" , "Nick" , "cage" , "Place of detention for criminals" , "Wormwood Scrubs, for example" .)