Crossword Genius

Moose held back by six-footer with chain (6)

Ross

I believe the answer is:

anklet

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'chain' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for anklet that I've seen before include "joint protector" , "Fetter" , "Leg decoration" , "Ornament for lower leg" , "Jewellery worn around the bottom of the leg" .)

I've seen this clue in the Sydney Morning Herald.
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