Hit on perfect comeback to sweet-talk (6,2)
I believe the answer is:
butter up
'sweet-talk' is the definition.
(both can mean to flatter someone)
'hit on perfect comeback' is the wordplay.
'hit on' becomes 'butt' (eg headbutting. I am not sure about the 'on' bit.).
'perfect' becomes 'pure' (synonyms).
'comeback' is a reversal indicator.
'pure' reversed gives 'erup'.
'butt'+'erup'='BUTTER UP'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for butter up that I've seen before include "Flatter using dairy product? (6, 2)" , "Flatter in order to get something" , "Flatter to obtain favour" , "like 17 [SWEET TALK]" , "mountain goat?" .)