Stroke by island country - it shows signs of wear (10)

I believe the answer is:

patination

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'it shows signs of wear' is the definition.
The definition suggests a singular noun which matches the answer.

'stroke by island country' is the wordplay.
'stroke' becomes 'pat' (pat can mean to stroke or touch).
'by' is a charade indicator (letters next to each other).
'island' becomes 'i' (geographical abbreviation).
'country' becomes 'nation' (synonyms).
'pat'+'i'+'nation'='PATINATION'

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I've seen this clue in The Irish Times.

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