Visit father at home (3,2)
I believe the answer is:
pop in
'visit' is the definition.
(thesaurus)
'father at home' is the wordplay.
'father' becomes 'pop ' (pop is a kind of father).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'pop'+'in'='POP IN'
(Other definitions for pop in that I've seen before include "Pay a quick informal visit" , "Call" , "Visit briefly" .)