Maybe Brownies left after dropping ecstasy in part of Shetland (4,4)
I believe the answer is:
fair isle
'part of shetland' is the definition.
(I know that Fair Isle is part of Shetland Islands)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fair isle that I've seen before include "Type of knitwear design" , "Multicoloured geometric knitting style" , "Fabric pattern" , "Traditional knitwear design" , "decorative knitting pattern" .)