Trophy poet keeps in old cabinet (8)
I believe the answer is:
cupboard
'cabinet' is the definition.
(I've seen this before)
'trophy poet keeps in old' is the wordplay.
'trophy' becomes 'cup' (cup is a kind of trophy).
'poet' becomes 'bard' (bard is a kind of poet).
'keeps in' indicates putting letters inside.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'bard' placed around 'o' is 'board'.
'cup'+'board'='CUPBOARD'
(Other definitions for cupboard that I've seen before include "Store for crockery etc" , "Hubbard found it bare" , "Furniture for storing provisions etc." , "Storage place" , "Locker" .)