Negotiate for free entertainment (5)
I believe the answer is:
treat
I believe this is a double definition.
'negotiate' is the first definition.
(I've seen this before)
'free entertainment' is the second definition.
(I've seen this before)
'for' acts as a link.
(Other definitions for treat that I've seen before include "Care for medically" , "Handle - delightful surprise" , "Tetra (anag.)" , "Source of gratification" , "Try to heal" .)