They are blue about slip in Dublin village (8)

I believe the answer is:

skerries

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'they are blue' is the definition.
The definition suggests an adverb but the answer is not.

'slip in dublin village' is the wordplay.
'slip' becomes 'err' (to err is to make an error).
'in' is an insertion indicator.
'dublin village' becomes 'skies' (I can't explain this - if you can you should give a lot more credence to this answer).
'err' placed inside 'skies' is 'SKERRIES'.

'about' is the link.

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I've seen this clue in The Irish Times.

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