Crossword Genius

Ratifies business superior to interpolar one? (8)

Ross

I believe the answer is:

confirms

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

'ratifies' is the definition.
The answer and definition can be both to do with social activities as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?

'business superior to interpolar one?' is the wordplay.
I cannot quite see how this works, but
'business' could be 'firm' (firm is a kind of business) and 'firm' is found within the answer.
The remaining letters 'cons' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for confirms that I've seen before include "Provides support for the truth of" , "Corroborates" , "Supports the truth of something" , "Provides supporting evidence of the truth" , "Finalises or makes definite" .)

I've seen this clue in The Independent.
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