Supporters helping (7)
I believe the answer is:
seconds
I believe this clue is a double definition.
'supporters' is the first definition.
(second is a kind of supporter)
'helping' is the second definition.
(as in another portion or helping at a meal)
(Other definitions for seconds that I've seen before include "Endorses proposal" , "Imperfect goods at reduced prices" , "Boxer's aides" , "Short periods of time for supporters" , "More food!" .)