Pays a call on (6)
I believe the answer is:
visits
'pays a call on' is the definition.
('visit' can be a synonym of 'pay a call on')
This is the entire clue.
(Other definitions for visits that I've seen before include "Pays a call" , "Comes by, drops in" , "Calls in to see" , "Social calls" , "Call to see" .)