Pretty sash adapted for dance in Scotland (10)
I believe the answer is:
strathspey
'dance in scotland' is the definition.
(type of Scottish folk dance)
'pretty sash adapted' is the wordplay.
'adapted' indicates anagramming the letters.
'pretty'+'sash'='prettysash'
'prettysash' anagrammed gives 'STRATHSPEY'.
'for' is the link.
(Other definitions for strathspey that I've seen before include "Scottish valley" , "Scot. country dance" , "Slow Scottish dance" .)