Apt tip duo devised for finish (3,4,2)
I believe the answer is:
put paid to
'finish' is the definition.
(I've seen this before)
'apt tip duo devised' is the wordplay.
'devised' indicates anagramming the letters.
'apt'+'tip'+'duo'='apttipduo'
'apttipduo' is an anagram of 'PUT PAID TO'.
'for' is the link.
(Other definitions for put paid to that I've seen before include "scotch?" , "Confirm bills settled" , "End - destroy" , "ended" , "Stop" .)