Being Irish, a first-class fellow (5)

I believe the answer is:

aidan

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'being irish' is the definition.
The definition suggests a singular noun which matches the answer.

'a first-class fellow' is the wordplay.
'a first class' becomes 'ai' (A1 - top quality).
'fellow' becomes 'dan' (man's name).
'ai'+'dan'='AIDAN'

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(Other definitions for aidan that I've seen before include "Irish fellow" , "Saint associated with Lindisfarne" .)

I've seen this clue in the Evening Standard.

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