A feast, so how can it be a refusal? (5)

I believe the answer is:

beano

I'm a little stuck... Click here to teach me more about this clue!

'a feast' is the definition.
(I've seen this before)

'be a refusal?' is the wordplay.
'refusal?' becomes 'no' (it's a no).
'be'+'a'+'no'='BEANO'

'so how can it' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for beano that I've seen before include "rowdy festivity" , "Kids' comic" , "Rowdy jollification" , "Comic - party" , "Enjoyable party" .)

I've seen this clue in the Evening Standard.

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