Husband occupying house an opportunist (7)
I believe the answer is:
chancer
'an opportunist' is the definition.
(someone taking chances)
'husband occupying house' is the wordplay.
I cannot really see how this works, but
'husband' could be 'h' (abbreviation) and 'h' is present in the answer.
'house' could be 'cancer' (Cancer is an example) and 'cancer' is present in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for chancer that I've seen before include "Exploiter of opportunity" , "One taking risks" , "Informally, one who tries his luck" , "opportunistic sort" , "Unscrupulous opportunist" .)