Favour being spread got round (4,4)
I believe the answer is:
good turn
'favour' is the definition.
(good turn is a kind of favour)
'spread got round' is the wordplay.
'spread' indicates anagramming the letters.
'got'+'round'='gotround'
'gotround' with letters rearranged gives 'GOOD TURN'.
'being' acts as a link.
(Other definitions for good turn that I've seen before include "Helping hand" , "''One . . . . . . . . deserves another'' (4, 4)" , "Helpful deed" , "Helpful act" , "Nice act" .)