Committee supporting trophy for store (8)
I believe the answer is:
cupboard
'store' is the definition.
(I've seen this before)
'committee supporting trophy' is the wordplay.
'committee' becomes 'board' (board is a kind of committee).
'supporting' means one lot of letters go next to another (in a down clue, some letters go below others).
'trophy' becomes 'cup' (cup is a kind of trophy).
'board' after 'cup' is 'CUPBOARD'.
'for' is the link.
(Other definitions for cupboard that I've seen before include "Closet" , "Where Old Mother Hubbard went to get her poor dog a bone" , "Hubbard found it bare" , "Furniture item for storage" , "Locker" .)