Brad and Angelina initially in love (4)
I believe the answer is:
nail
'brad' is the definition.
(I've seen this before)
'angelina initially in love' is the wordplay.
'initially' indicates taking the first letters.
'in' means one lot of letters goes inside another.
'love' becomes 'nil' (I've seen this before).
The first letter of 'angelina' is 'a'.
'a' placed inside 'nil' is 'NAIL'.
'and' is the link.
(Other definitions for nail that I've seen before include "Metal fastener" , "Small metal spike" , "Hit this on the head to be dead right" , "Fastening device" , "Hit this on the head to be absolutely right" .)