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Flatter bloomer, less cooked on top (6,2)

Ross

I believe the answer is:

butter up

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'flatter' is the definition.
(buttering up is a kind of flattering)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for butter up that I've seen before include "Flatter to obtain favour" , "Flatter using common dairy product" , "like 17 [SWEET TALK]" , "Soft-soap" , "mountain goat?" .)

I've seen this clue in The Sunday Times and The Times.
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