Supporting offers made hostile (10)
I believe the answer is:
forbidding
'hostile' is the definition.
(thesaurus)
'supporting offers' is the wordplay.
'supporting' becomes 'for' (I've seen this in another clue).
'offers' becomes 'bidding' (an offer is a bid).
'for'+'bidding'='FORBIDDING'
'made' is the link.
(Other definitions for forbidding that I've seen before include "sinister" , "Grim" , "Ominous" , "Banning" .)