Spirit that can be released by rubber (5)

I believe the answer is:

genie

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'spirit' is the definition.
(genie is a kind of spirit)

I cannot understand how the rest of the clue works.

(Other definitions for genie that I've seen before include "In Arabian Nights, a magic goblin" , "Magician residing in a lamp" , "Arabian goblin, may be in a bottle" , "Arabian spirit as in Aladdin's lamp" , "Magic spirit" .)

I've seen this clue in The Times.

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