Contented with bivvy (4)
I believe the answer is:
tent
'bivvy' is the definition.
(I've seen this before)
'contented with' is the wordplay.
'with' indicates a hidden word.
'TENT' is hidden within 'contented'.
(Other definitions for tent that I've seen before include "Guy" , "Temporary residence" , "Marquee" , "Temporary accommodation" , "pavilon" .)