Casual way in which you remove a glove? (7)

I believe the answer is:

offhand

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'casual' is the definition.
(synonyms)

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

(Other definitions for offhand that I've seen before include "Ungraciously curt" , "Without thought" , "Where fingerprints are taken" , "Casual or curt, like discarded glove?" , "Of behaviour, casual or curt" .)

I've seen this clue in The Globe and Mail.

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