Rocker possibly gives shock to clubs (5)
I believe the answer is:
chair
'rocker possibly' is the definition.
(I know that rocking chair is a type of chair)
'shock to clubs' is the wordplay.
'shock' becomes 'hair' (shock can mean a mass of hair).
'to' means one lot of letters go next to another (I've seen this in other clues).
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'hair' put after 'c' is 'CHAIR'.
'gives' acts as a link.
(Other definitions for chair that I've seen before include "president" , "Professorship" , "Windsor, for example" , "Top seat of committee" , "Official position of authority" .)