One model saying pat words of finality (3,1,4)

I believe the answer is:

its a wrap

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'words of finality' is the definition.
I know nothing about this answer so I can't tell whether this works.

'one model saying pat' is the wordplay.
'one' becomes 'i' (Roman numeral).
'model' becomes 'T' (Ford Model T car).
'saying' becomes 'saw' (saw is a kind of saying).
'pat' becomes 'rap' (synonyms).
'i'+'t'+'saw'+'rap'='ITS A WRAP'

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

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