It's not a nail produced by one seeking political independence (11)

I believe the answer is:

nationalist

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'one seeking political independence' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'it's not a nail produced' is the wordplay.
'produced' is an anagram indicator.
'its'+'not'+'a'+'nail'='itsnotanail'
'itsnotanail' anagrammed gives 'NATIONALIST'.

'by' is the link.

Can you help me to learn more?

(Other definitions for nationalist that I've seen before include "extreme politician" , "advocator of independence?" , "Chauvinist" , "Extreme patriot" .)

I've seen this clue in The Irish Independent.

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