Heading north, go round quite posh Scottish town (8)
I believe the answer is:
ullapool
'scottish town' is the definition.
(Ullapool is a village in Scotland)
'heading north go round quite posh' is the wordplay.
'heading north' shows that the letters should be reversed in order.
'go round' becomes 'loop' (to loop is to go round and round).
'quite' becomes 'all' (I've seen this before).
'posh' becomes 'u' (abbreviation for upper-class - opposite to non-u).
'loop'+'all'+'u'='loopallu'
'loopallu' backwards is 'ULLAPOOL'.
(Other definitions for ullapool that I've seen before include "Scottish Highlands town on Loch Broom" , "Scots west coast town" , "Scots town on Loch Broom" .)