"Beware the lure within her lovely tresses / The splendid sole ____ of her hair' (Goethe's Faust) (9)

I believe the answer is:

adornment

(Other definitions for adornment that I've seen before include "Ornamentation" , "decking" , "Making elaborate" , "Trim" , "Embellishment" .)

I've seen this clue in The Times.

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