Naughty girl in furs, we hear (4)
I believe the answer is:
minx
'naughty girl' is the definition.
'furs we hear' is the wordplay.
'furs' becomes 'minks' (mink is a kind of fur).
'we hear' indicates a 'sounds like' (homophone) clue.
'minks' is a homophone of 'MINX'.
'in' acts as a link.
(Other definitions for minx that I've seen before include "flirty girl" , "Boldly flirtatious young woman" , "miss making mischief" , "Bold, flirtatious woman" , "Flirtatious female" .)