Bad taste in house with green interior (9)
I believe the answer is:
indecorum
'bad taste' is the definition.
(indecorum can mean bad taste or bad manners)
'in house with green interior' is the wordplay.
'house' becomes 'drum' (I've seen this before).
'with' says to put letters next to each other.
'green' becomes 'eco' (abbreviation for ecological).
'interior' is an insertion indicator.
'in'+'drum'='indrum'
'indrum' going around 'eco' is 'INDECORUM'.
(Other definitions for indecorum that I've seen before include "unseemly behaviour" , "impropriety" , "Naughty behaviour" , "bad taste" , "Improper behaviour" .)