Something charged after support army (6)
I believe the answer is:
legion
'army' is the definition.
(legion is a kind of army)
'something charged after support' is the wordplay.
'something charged' becomes 'ion'.
'after' is a charade indicator (letters next to each other).
'support' becomes 'leg' (leg is a kind of support).
'ion' after 'leg' is 'LEGION'.
(Other definitions for legion that I've seen before include "Military force - in Lego (anag)" , "A great number in the Roman military unit" , "Host" , "Large military force" , "Military unit of ancient Rome" .)