Platform said to be repaired (4)
I believe the answer is:
dais
'platform' is the definition.
(dais is a kind of platform)
'said to be repaired' is the wordplay.
'to be repaired' indicates an anagram.
'said' with letters rearranged gives 'DAIS'.
(Other definitions for dais that I've seen before include "device to give some an uplift at conference?" , "support for speaker" , "Platform, rostrum" , "Low platform at end of hall" , "stepping up here?" .)