Do head over (5)

I believe the answer is:

beano

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'do' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'head over' is the wordplay.
'head' becomes 'bean' (bean is a kind of head).
'over' becomes 'o' (cricket abbreviation).
'bean'+'o'='BEANO'

Can you help me to learn more?

(Other definitions for beano that I've seen before include "Junket - children's comic" , "Informal party" , "A bone for a feast" , "Celebration" , "Enjoyable party" .)

I've seen this clue in the Sydney Morning Herald.

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