Cross husband leaves finally - roll the joint (5)

I believe the answer is:

ankle

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'the joint' is the definition.
(joint of the body)

I can't explain the remainder of the clue.

(Other definitions for ankle that I've seen before include "Bone over foot" , "Leg-joint" , "Human joint" , "Major foot joint" , "Narrow part of leg" .)

I've seen this clue in The Independent.

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