Call girl, model (5)
I believe the answer is:
visit
'call' is the definition.
('visit' can be a synonym of 'call')
'girl model' is the wordplay.
'girl' becomes 'vi' (**).
'model' becomes 'sit' ('sit' can be a synonym of 'model').
'vi'+'sit'='VISIT'
(Other definitions for visit that I've seen before include "Call upon" , "Call in to see, socially or on business" , "Come to see" , "Call on - stay" , "Call on - go to see" .)