Directors supporting trophy cabinet (8)
I believe the answer is:
'cabinet' is the definition.
(I've seen this before)
'directors supporting trophy' is the wordplay.
'directors' becomes 'board' (board of directors).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'trophy' becomes 'cup' (cup is a kind of trophy).
'board' after 'cup' is 'CUPBOARD'.
(Other definitions for cupboard that I've seen before include "Storage unit" , "Kitchen storage" , "Closet" , "Store for crockery etc" , "Where Old Mother Hubbard went to get her poor dog a bone" .)