Give insincere praise that's less sparkling (7)
I believe the answer is:
'give' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for flatter that I've seen before include "drier" , "Become" , "Less hilly; show to advantage" , "Fawn, blandish" , "Compliment dishonestly" .)