Oddly, soul rap albums provide something extra (7)
I believe the answer is:
'something extra' is the definition.
'oddly soul rap albums' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternate letters of 'soulrapalbums' are 'SURPLUS'.
'provide' is the link.
(Other definitions for surplus that I've seen before include "Unneeded extra", "unnecessary", "Superabundance", "Redundant", "Excess, extra".)