Immobilise leg (3)

I believe the answer is:

This clue is a double definition.

'immobilise' is the first definition.
(as in to pin someone down)

'leg' is the second definition.
(pin is a kind of leg)

(Other definitions for pin that I've seen before include "Fastener; brooch" , "Flagged stick placed in golf hole" , "Fastener; skittle" , "Debit-card number" , "Secure" .)

I've seen this clue in The Times.

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