Favour for each grasping judge (6)
I believe the answer is:
prefer
'favour' is the definition.
('prefer' can be a synonym of 'favour')
'each grasping judge' is the wordplay.
'each' becomes 'per'.
'grasping' means one lot of letters goes inside another.
'judge' becomes 'ref'.
'per' enclosing 'ref' is 'PREFER'.
'for' acts as a link.
(Other definitions for prefer that I've seen before include "Favour, like better" , "Promote; like better" , "Tend to choose (one thing over another)" , "as one may with charges" , "Advance" .)