Moved sinuously without shirt at first (or anything else) (5)

I believe the answer is:

naked

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'else' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for naked that I've seen before include "unprotected" , "In one's birthday suit" , "Bare" , "In the altogether" , "Stark" .)

I've seen this clue in The Times.

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