Argue with sister about dad . . . (4)
I believe the answer is:
spar
'argue' is the definition.
(sparring is a kind of arguing)
'sister about dad' is the wordplay.
'sister' becomes 'sr' (abbreviation as in names of nuns).
'about' is an insertion indicator.
'dad' becomes 'pa' (both can mean one's father).
'sr' placed around 'pa' is 'SPAR'.
'with' is the link.
(Other definitions for spar that I've seen before include "Close friend" , "Raps with wooden beam" , "Sticks" , "Go a few rounds with the ship's pole" , "Raps with large beam" .)