Sort out strange platform (7)
I believe the answer is:
rostrum
'platform' is the definition.
(I know that rostrum is a type of platform)
'sort out strange' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'strange' becomes 'rum' (similar in meaning).
'sort' is an anagram of 'rost'.
'rost'+'rum'='ROSTRUM'
(Other definitions for rostrum that I've seen before include "Platform for public speakers" , "At which one may conduct" , "Platform for speaker" , "Rum rots (anag)" , "beak" .)