Insincere flatterer (5)
I believe the answer is:
toady
'insincere flatterer' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toady that I've seen before include "Curry favour" , "fawn" , "Yes-man" , "crawler" , "Flatterer or sycophant" .)