Greek island containing black swans (4)
I believe the answer is:
cobs
'swans' is the definition.
(cob is a kind of swan)
'greek island containing black' is the wordplay.
'greek island' becomes 'cos' (Cos is a Greek island).
'containing' indicates putting letters inside.
'black' becomes 'b' (as in pencil classifications).
'cos' going around 'b' is 'COBS'.
(Another definition for cobs that I've seen is " Adult male swans".)
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