Cork, perhaps; goalkeeper (7)
I believe the answer is:
stopper
I believe this is a double definition.
'cork perhaps' is the first definition.
(I know that bottle cork is a type of stopper)
'goalkeeper' is the second definition.
(someone who stops goals)
(Other definitions for stopper that I've seen before include "Bung" , "Perhaps cork" , "Maybe cork" , "One blocks" , "Plug - cork" .)