Is following back now, from the platform (4)
I believe the answer is:
dais
'the platform' is the definition.
(dais is a kind of platform)
'is following back now' is the wordplay.
'following' is a charade indicator (letters next to each other).
'back' is a reversal indicator.
'now' becomes 'AD' (AD, Anno Domini, as opposed to BC, Before Christ).
'ad' backwards is 'da'.
'is' after 'da' is 'DAIS'.
'from' acts as a link.
(Other definitions for dais that I've seen before include "Platform, rostrum" , "stepping up here?" , "Throne platform" , "stage" , "Said (anag.)" .)