Unbounded sport expertise starts to enrich new county town (11)

I believe the answer is:

enniskillen

I'm a little stuck... Click here to teach me more about this clue!

'county town' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see an association between them that I don't see?

'unbounded sport expertise starts to enrich new' is the wordplay.
'unbounded sport' becomes 'enni' (I can't justify this - if you can you should believe this answer much more).
'expertise' becomes 'skill' (I've seen this in another clue).
'starts to' suggests taking the first letters.
The initial letters of 'enrich new' is 'en'.
'enni'+'skill'+'en'='ENNISKILLEN'

Can you help me to learn more?

(Another definition for enniskillen that I've seen is " Town in county Fermanagh".)

I've seen this clue in The Independent.

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