Due round part of house (5)
I believe the answer is:
owing
'due' is the definition.
(similar in meaning)
'round part of house' is the wordplay.
'round' becomes 'o' (round can mean a round object).
'part of house' becomes 'wing'.
'o'+'wing'='OWING'
(Other definitions for owing that I've seen before include "Unpaid" , "Still outstanding" , "Outstanding as a debt" , "Due to, like debt" , "Unsettled; on account" .)