Man of convenience in America? (4)

I believe the answer is:

john

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This could be a double definition.

'man' is the first definition.
(I've seen this before)

'convenience in america?' is the second definition.
'John' can be an answer for 'convenience' (thesaurus). I am unsure of the 'in america?' bit.

'of' is the link.

Can you help me to learn more?

(Other definitions for john that I've seen before include "One of the Gospel writers" , "gospeller" , "Magna Carta king" , "Man's name" , "English king in play" .)

I've seen this clue in The Sun.

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