The remainder live around the bend (7)
I believe the answer is:
residue
'the remainder' is the definition.
(residue means a remainder or remains)
'live around the bend' is the wordplay.
'live' becomes 'reside' (synonyms).
'around' indicates putting letters inside.
'the bend' becomes 'U' (a U-bend is a kind of bend - pipe under sink).
'reside' going around 'u' is 'RESIDUE'.
(Other definitions for residue that I've seen before include "Deposit" , "Matter left behind after other parts have been taken away" , "Something remaining" , "Remaining portion" , "waste" .)