Order to bar pianist is 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)
'order to bar pianist' is the wordplay.
'bar pianist' can be anagrammed to 'BIPARTISAN'.
But, I am not sure how the anagram is indicated.
'is' acts as a link.
Can you help me to learn more?
(Other definitions for bipartisan that I've seen before include "Supported by both sides - aspirin tab (anag)" , "Like a coalition government" , "Involving agreement across political divides" , "Involving the agreement of two parties" , "supported by two political parties!" .)