Rate the setter 'fantastic' for providing a form of entertainment (6,7)
I believe the answer is:
street theatre
'a form of entertainment' is the definition.
(street theatre is a type of entertainment)
'rate the setter fantastic' is the wordplay.
'fantastic' indicates anagramming the letters.
'rate'+'the'+'setter'='ratethesetter'
'ratethesetter' is an anagram of 'STREET THEATRE'.
'for providing' is the link.
(Other definitions for street theatre that I've seen before include "Drama in a way" , "Open-air drama" , "Town-centre dramatic performance" , "Open-air entertainment" , "Drama enacted outdoors" .)