Crossword Genius

Spiral form (5)

Ross

I believe the answer is:

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 Times and The Sunday Times.
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