English flag is placed on Scottish island (5)
I believe the answer is:
tiree
'scottish island' is the definition.
(island of the Inner Hebrides)
'english flag is placed on' is the wordplay.
'english' becomes 'E' (abbreviation as in OED).
'flag' becomes 'tire' (both can mean to become weary).
'is placed on' says to put letters next to each other (in a down clue, some letters go on top of others).
'e' put after 'tire' is 'TIREE'.
(Other definitions for tiree that I've seen before include "One of the Inner Hebrides" , "small island" , "Isle of Inner Hebrides" , "Scottish island of the Inner Hebrides" , "Hebridean island" .)