Supported by both sides (10)
I believe the answer is:
bipartisan
'supported by both sides' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bipartisan that I've seen before include "As is cooperation between two parties" , "Involving agreement across political divides" , "Involving the agreement of two parties" , "using both sides" , "Cooperative" .)