Conceals most of meal with, I guess, bananas (9)

I believe the answer is:

disguises

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'conceals' is the definition.
(disguising is a kind of concealing)

'most of meal with i guess bananas' is the wordplay.
'most of' means to remove the last letter.
'meal' becomes 'dish' (I've seen this in other clues).
'with i guess bananas' becomes 'guises' (I can't justify this - if you can you should give a lot more credence to this answer).
'dish' with its last letter taken off is 'dis'.
'dis'+'guises'='DISGUISES'

Can you help me to learn more?

(Another definition for disguises that I've seen is " Camouflages, masks".)

I've seen this clue in The Telegraph.

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