Hunter's sleeping-place with popular backing (6)
I believe the answer is:
nimrod
'hunter's' is the definition.
(I've seen this in another clue)
'sleeping-place with popular backing' is the wordplay.
'sleeping place' becomes 'dorm' (dormitory).
'with' is a charade indicator (letters next to each other).
'popular' becomes 'in' ('in' can mean trendy).
'backing' shows that the letters should be reversed in order.
'dorm'+'in'='dormin'
'dormin' backwards is 'NIMROD'.
(Other definitions for nimrod that I've seen before include "Might hunter of Genesis" , "Best-known of Elgar's Enigma Variations" , "Skilful hunter (Genesis)" , "Biblical hunter - aircraft" , "One of Elgar's Enigma Variations" .)