Outlaw can, if put on spot (6,4)
I believe the answer is:
little john
'outlaw' is the definition.
(associate of Robin Hood)
'can if put on spot' is the wordplay.
'can' becomes 'john' (slang for toilet).
'if put on' means one lot of letters go next to another.
'spot' becomes 'little' (a spot e.g. of milk can mean a little).
'john' put after 'little' is 'LITTLE JOHN'.
(Other definitions for little john that I've seen before include "big man in 7 [FOREST]" , "One of Robin Hood's followers" , "Outlaw" , "Robin Hood's giant follower" , "Associate of 8 10" .)