Is worth it (4)
I believe the answer is:
pays
'is worth it' is the definition.
('pay' can be a synonym of 'be worth it')
This is all the clue.
(Other definitions for pays that I've seen before include "Is profitable, country (Fr.)" , "Imburses" , "Settles a bill" , "Coughs up" , "stumps up" .)