Highly complicated — full of twists and turns (8)

I believe the answer is:

tortuous

(Other definitions for tortuous that I've seen before include "Devious, circuitous" , "Devious, twisty" , "Full of twistings and windings" , "Painfully intricate" , "Full of twists and turns, devious" .)

I've seen this clue in The Guardian.

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