Kidnap victim, female wearing old clothes, turned up (7)

I believe the answer is:

shergar

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'kidnap victim' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'female wearing old clothes turned up' is the wordplay.
'female' becomes 'her' (I've seen this in another clue).
'wearing' indicates putting letters inside.
'old clothes' becomes 'rags' (I've seen this in another clue).
'turned up' is a reversal indicator.
'rags' in reverse letter order is 'sgar'.
'her' placed within 'sgar' is 'SHERGAR'.

Can you help me to learn more?

(Other definitions for shergar that I've seen before include "Racehorse" , "Abducted Derby winner" .)

I've seen this clue in The Independent.

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