Snakelike aircraft? (6)

I believe the answer is:

glider

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'aircraft?' is the definition.
(glider is a kind of aircraft)

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

(Other definitions for glider that I've seen before include "Unpowered aircraft" , "Kind of aircraft without an engine" , "taking flight?" , "Flying machine without engine" , "Powerless traveller" .)

I've seen this clue in the Evening Standard.

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