Pound home point of fishing tackle (4)
I believe the answer is:
line
'fishing tackle' is the definition.
(as in a fishing line)
'pound home point' is the wordplay.
'pound' becomes 'l'.
'home' becomes 'in' ('he's home' can mean 'he's in').
'point' becomes 'e' (E is an example).
'l'+'in'+'e'='LINE'
'of' is the link.
(Other definitions for line that I've seen before include "business" , "cover on the inside" , "Fill" , "Dress" , "Row; track" .)