Belonging to Eleanor, a kilt jacket (6)

I believe the answer is:

anorak

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'jacket' is the definition.
(anorak is a kind of jacket)

I don't understand how the remainder of the clue works.

(Other definitions for anorak that I've seen before include "Coat (for the boringly obsessive?)" , "Casual jacket with hood and zip" , "Casual outerwear" , "Garment; studious person" , "good on most figures?" .)

I've seen this clue in The Telegraph.

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