Run out, suspicious about stone platform (7)
I believe the answer is:
rostrum
'platform' is the definition.
(I know that rostrum is a type of platform)
'run out suspicious about stone' is the wordplay.
'run out' becomes 'RO' (cricket abbreviation).
'suspicious' becomes 'rum' (rum can mean strange or dubious).
'about' is a charade indicator (letters next to each other).
'stone' becomes 'st' (abbreviation).
'rum' after 'st' is 'strum'.
'ro'+'strum'='ROSTRUM'
(Other definitions for rostrum that I've seen before include "Raised platform" , "Rum rots (anag)" , "Conductor's dais" , "At which one may conduct" , "Platform for public speaking" .)