Releases Scottish isle's urban music? (8)

I believe the answer is:

unstraps

I'm a little stuck... Click here to teach me more about this clue!

'releases scottish isle's' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?

'urban music?' is the wordplay.
I cannot quite understand how this works, but
'music?' could be 'tra' (I've seen this in another clue) and 'tra' is found in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

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