Platform for rum sort, perhaps (7)
I believe the answer is:
rostrum
'platform' is the definition.
(I know that rostrum is a type of platform)
'rum sort perhaps' is the wordplay.
'perhaps' indicates an anagram.
'rum'+'sort'='rumsort'
'rumsort' is an anagram of 'ROSTRUM'.
'for' acts as a link.
(Other definitions for rostrum that I've seen before include "beak" , "Rum rots (anag)" , "Platform for speaker" , "stage" , "Platform for public speaking" .)