Burn detached houses (4)
I believe the answer is:
ache
'burn' is the definition.
(I've seen this before)
'detached houses' is the wordplay.
'houses' indicates the answer is hidden within the clue (part of the clue houses the answer).
'ACHE' is hidden in the letters of 'detached'.
(Other definitions for ache that I've seen before include "Pine" , "Nagging pain" , "Cause pain" , "Dull throbbing pain" , "Continuous hurt" .)