Dad left with a friend (3)
I believe the answer is:
pal
'a friend' is the definition.
(pal is a kind of friend)
'dad left' is the wordplay.
'dad' becomes 'pa' ('pa' can be a synonym of 'dad').
'left' becomes 'l' (common abbreviation).
'pa'+'l'='PAL'
'with' is the link.
(Other definitions for pal that I've seen before include "Close friend" , "Brother" , "Mate, informal friend" , "Mate, buddy" , "Crony" .)