More voguish jail? (6)
I believe the answer is:
cooler
I believe this clue is a double definition.
'more voguish' is the first definition.
'jail?' is the second definition.
(thesaurus)
(Other definitions for cooler that I've seen before include "Prison - less warm" , "It's not so hot" , "less enthusiastic" , "more sophisticated" , "Fan" .)