Get involved with formalities before boxing match (7)

I believe the answer is:

weighin

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'formalities before boxing match' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'get involved' is the wordplay.
'get' becomes 'weigh' (I am not sure about this - if you are sure you should believe this answer much more).
'involved' becomes 'in' (to be involved in something is to be 'in' it).
'weigh'+'in'='WEIGHIN'

'with' acts as a link.

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I've seen this clue in The Irish Times.

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