Wild flower, less cold and flatter (6,2)
I believe the answer is:
butter up
'flatter' is the definition.
(buttering up is a kind of flattering)
'wild flower less cold' is the wordplay.
'wild flower' becomes 'buttercup' (I've seen this before).
'less' is a deletion indicator.
'cold' becomes 'c' (eg on taps).
'buttercup' with 'c' taken away is 'BUTTER UP'.
'and' acts as a link.
(Other definitions for butter up that I've seen before include "Flatter in order to get something" , "like 17 [SWEET TALK]" , "Flatter using common dairy product" , "Flatter to obtain favour" , "Work on" .)