Laid back contingent of Scots up in Edinburgh (6)

I believe the answer is:

supine

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'laid back contingent' is the definition.
Both the definition and answer are adjectives. Perhaps they are linked in a way I don't understand?

'of scots up in edinburgh' is the wordplay.
'of' indicates the answer is hidden within the clue.
'SUPINE' is hidden in the letters of 'scots up in edinburgh'.

Can you help me to learn more?

(Other definitions for supine that I've seen before include "Prostrate" , "Slow in acting" , "Recumbent" , "Laid-back" , "looking up" .)

I've seen this clue in The Independent.

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