Plant one in Scotland around isle (5)
I believe the answer is:
anise
'plant' is the definition.
(anise plant is a kind of plant)
'one in scotland around isle' is the wordplay.
'one in scotland' becomes 'ane' (I've seen this in another clue).
'around' means one lot of letters goes inside another.
'isle' becomes 'is' (abbreviation).
'ane' enclosing 'is' is 'ANISE'.
(Other definitions for anise that I've seen before include "Plant with liquorice-flavoured seeds" , "Plant giving ouzo flavour" , "Plant with seeds used as flavouring" , "Plant providing flavour similar to liquorice" , "Plant with aromatic seeds" .)