To say flattering things about Charlie, is a bloomer (9)

I believe the answer is:

buttercup

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'to say flattering things' is the definition.
I can't judge whether this definition defines the answer.

'about charlie is a bloomer' is the wordplay.
'about' is an insertion indicator.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'is a bloomer' becomes 'butterup' (I can't explain this - if you can you should believe this answer much more).
'c' placed into 'butterup' is 'BUTTERCUP'.

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(Other definitions for buttercup that I've seen before include "Bumboat woman" , "Meadow flower poisonous to cattle" , "Common yellow meadow plant" , "Bright yellow flower" , "Goldilocks, possibly" .)

I've seen this clue in the Evening Standard.

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