Statesperson, one given bagel and pasty (5)

I believe the answer is:

iowan

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'statesperson' is the definition.
I can't tell whether this definition defines the answer.

'one given bagel and pasty' is the wordplay.
'one' becomes 'i' (Roman numeral).
'given' is a charade indicator (letters next to each other).
'bagel' becomes 'O' (bagel can mean a score of zero in tennis).
'and' means one lot of letters go next to another.
'pasty' becomes 'wan' (synonyms).
'i'+'o'+'wan'='IOWAN'

Can you help me to learn more?

(Other definitions for iowan that I've seen before include "US resident" , "From a US state, capital Des Moines" , "From one US state" , "Statesman" , "Someone from the Midwest - a wino? (anag)" .)

I've seen this clue in The Guardian.

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