Stand firmly against, do (5)

I believe the answer is:

beano

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'do' is the definition.
(they both mean party)

'stand firmly against' is the wordplay.
'stand firmly' becomes 'bea' (I can't explain this - if you can you should give a lot more credence to this answer).
'against' becomes 'no'.
'bea'+'no'='BEANO'

Can you help me to learn more?

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

I've seen this clue in The Times.

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