A quarantine, in Irish isles (4)

I believe the answer is:

aran

I'm a little stuck... Click here to teach me more about this clue!

'a quarantine in irish isles' is the definition.
I can't tell whether this defines the answer.

'a quarantine in' is the wordplay.
'in' says the answer is hidden in the clue.
'ARAN' is hidden in the letters of 'quarantine'.

Can you help me to learn more?

(Other definitions for aran that I've seen before include "Irish style of knitwear" , "Galway Bay isle" , "-- Islands; -- sweater" , "Irish islands" , "traditional type of knitwear" .)

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