Rod associated with a Scottish island (6)
I believe the answer is:
staffa
'scottish island' is the definition.
(I've seen this before)
'rod associated with a' is the wordplay.
'rod' becomes 'staff' (I've seen this in another clue).
'associated with' says to put letters next to each other.
'staff'+'a'='STAFFA'
(Other definitions for staffa that I've seen before include "Scottish island" , "Fingal's cave isle" , "Inch" , "Fingal's Cave location" , "Hebridean isle" .)