In favour of grizzly refrain (7)
I believe the answer is:
forbear
'refrain' is the definition.
(I know that forbear is a kind of refrain)
'in favour of grizzly' is the wordplay.
'in favour of' becomes 'for' (being for a particular cause).
'grizzly' becomes 'bear' (I've seen this in another clue).
'for'+'bear'='FORBEAR'
(Other definitions for forbear that I've seen before include "Abstain" , "Hold back" , "Be patient" , "Refrain from doing something" .)