Given as a favour (2,6)
I believe the answer is:
ex gratia
'given as a favour' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ex gratia that I've seen before include "Given as a favour (Latin)" , "As a favour, not compelled by legal right" , "Given as concession without legal compulsion" , "(Of payment) given as a favour but not required" , "(Payment) without admission of liability" .)