Pay for someone else's enjoyment (5)
I believe the answer is:
treat
'pay for someone else's enjoyment' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for treat that I've seen before include "Tetra (anag.)" , "Deal with sickness" , "Indulgence; deal with" , "Nurse" , "Entertain at one's own expense" .)