Burning pictures outside study (6)
I believe the answer is:
ardent
'burning' is the definition.
(I've seen this before)
'pictures outside study' is the wordplay.
'pictures' becomes 'art'.
'outside' is an insertion indicator.
'study' becomes 'den' (term for a study or office).
'art' going around 'den' is 'ARDENT'.
(Other definitions for ardent that I've seen before include "Ranted badly and became earnest in love" , "full of zeal" , "Burning, passionate" , "Ranted, being passionate" , "Passionate and glowing" .)