Leaders of Anglo-French business make an assertion (6)

I believe the answer is:

affirm

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'make an assertion' is the definition.
'affirm' can be an answer for 'make' (thesaurus). I'm not certain of the 'an assertion' bit.

'leaders of anglo-french business' is the wordplay.
'leaders of' indicates taking the first letters.
'business' becomes 'firm' (firm is a kind of business).
The first letters of 'anglo french' is 'af'.
'af'+'firm'='AFFIRM'

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(Other definitions for affirm that I've seen before include "Asseverate" , "Publicly state" , "Endorse" , "Confidently put" , "Ratify; vouch" .)

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