Man covering R&B and bit of soul rocks (7)
I believe the answer is:
marbles
'rocks' is the definition.
(marble is a kind of rock)
'man covering rb and bit of soul' is the wordplay.
'man' becomes 'male' ().
'covering' is an insertion indicator.
'and' says to put letters next to each other.
'bit of' says to take the initial letters.
The initial letter of 'soul' is 's'.
'male' enclosing 'rb' is 'marble'.
'marble'+'s'='MARBLES'
(Other definitions for marbles that I've seen before include "Glass balls to play with" , "Mind" , "Game with alleys and taws" , "alleys, perhaps" , "Small spheres of glass - statuary" .)