Sue is about to pin this on your back (6)

I believe the answer is:

supine

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'on your back' is the definition.
I can't tell whether this definition defines the answer.

'sue is about to pin' is the wordplay.
'is about' indicates putting letters inside.
'sue' going around 'pin' is 'SUPINE'.

'this' is the link.

Can you help me to learn more?

(Other definitions for supine that I've seen before include "Unresisting" , "Lying on one's back - passive" , "Prostrate" , "Use pin (anag.)" , "Lying face upwards, indolent" .)

I've seen this clue in the Sydney Morning Herald.

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