A long dispute concerning England (5)

I believe the answer is:

anglo

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'england' is the definition.
Both the definition and answer are singular nouns.
Maybe there's a link between them I don't understand?

'a long dispute' is the wordplay.
'dispute' is an anagram indicator (I've seen 'disputed' mean this).
'long' is an anagram of 'nglo'.
'a'+'nglo'='ANGLO'

'concerning' acts as a link.

Can you help me to learn more?

(Other definitions for anglo that I've seen before include "Prefix meaning English or British" , "Prefix denoting English" .)

I've seen this clue in The Irish Independent.

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