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Weakness for charmers I acquired in the past amid temptation (8)

Ross

I believe the answer is:

ligature

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'weakness' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for ligature that I've seen before include "band" , "Thread used to constrict the flow of blood" , "It bids to restrict blood flow" , "Binding used for strangulation" , "Surgical, musical, tie" .)

I've seen this clue in The Sunday Times and The Times.
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