Reversed roles for band (5)
I believe the answer is:
strap
'band' is the definition.
(strap is a kind of band)
'reversed roles' is the wordplay.
'reversed' says the letters should be written backwards.
'roles' becomes 'parts' ('part' can be a synonym of 'role').
'parts' back-to-front is 'STRAP'.
'for' is the link.
(Other definitions for strap that I've seen before include "Strong band for binding luggage etc" , "Length or loop, of leather perhaps" , "something to hang on to" , "Whip" , "Security device" .)