Crossword Genius

Creature identified by duke on small low-lying island (6)

Ross

I believe the answer is:

donkey

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'creature' is the definition.
(type of animal)

'duke on small low-lying island' is the wordplay.
'duke' becomes 'd' (abbreviation).
'small low lying island' becomes 'key' (I can't justify this - if you can you should give a lot more credence to this answer).
'd'+'on'+'key'='DONKEY'

'identified by' acts as a link.

Can you help me to learn more?

(Other definitions for donkey that I've seen before include "Ass; stupid person" , "- Jacket, - work" , "Garment associated with building workers" , "Domesticated animal" , "Burro" .)

I've seen this clue in The Times.
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