One involved in hold-up? (6)

I believe the answer is:

garter

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'one involved in hold-up?' is the definition.
The definition suggests a singular noun which matches the answer.

This is the entire clue.

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(Other definitions for garter that I've seen before include "Band to keep a stocking or sleeve up" , "- Belt; - snake; - stitch" , "Band worn on leg" , "Band involved in hold-up" , "Band around the leg or arm" .)

I've seen this clue in The Sun.

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