Pens work in Greek island (5)

I believe the answer is:

coops

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'pens' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I can't see?

'work in greek island' is the wordplay.
'work' becomes 'op' (abbreviation for opus).
'in' is an insertion indicator.
'greek island' becomes 'cos' (Cos is a Greek island).
'op' put within 'cos' is 'COOPS'.

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