Phone home with golf a vocation (7)
I believe the answer is:
calling
'a vocation' is the definition.
(synonyms)
'phone home with golf' is the wordplay.
'phone' becomes 'call' (synonyms).
'home' becomes 'in' ('he's home' can mean 'he's in').
'with' means one lot of letters go next to another.
'golf' becomes 'g' (phonetic alphabet: alpha, bravo, charlie etc.).
'call'+'in'+'g'='CALLING'
(Other definitions for calling that I've seen before include "Predicting the outcome" , "Ringing" , "visiting" , "Urge to follow a particular career" , "Running a bingo game" .)