Spiral form (5)

I think it could be either:

Which length description are you looking for?:

helix

(Other definitions for helix that I've seen before include "Structure consisting of something wound in a continuous series of loops" , "Three-dimensional object shaped like a corkscrew" , "Spiral shape" , "Intertwining with another" , "Screwed coil" .)

I've seen this clue in The Sunday Times and The Times.

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