How we speak arranging pact or in union ... (13)

I believe the answer is:

pronunciation

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'how we speak' is the definition.
I can't tell whether this defines the answer.

'arranging pact or in union' is the wordplay.
'arranging' indicates an anagram.
'pact'+'or'+'in'+'union'='pactorinunion'
'pactorinunion' is an anagram of 'PRONUNCIATION'.

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(Other definitions for pronunciation that I've seen before include "Delivery" , "Articulation" , "Way a word is sounded" .)

I've seen this clue in The Independent.

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