Heavens! An English or Scottish island (4)
I believe the answer is:
skye
'scottish island' is the definition.
(I've seen this in another clue)
'heavens an english' is the wordplay.
'heavens' becomes 'sky' (sky is a kind of heavens).
'an english' becomes 'E' (abbreviation).
'sky'+'e'='SKYE'
'or' acts as a link.
(Other definitions for skye that I've seen before include "Largest isle of the Inner Hebrides" , "Large Scottish island" , "Where Bonnie Prince Charlie fled after his defeat at Culloden" , "Scots isle" , "somewhere off Scotland's west coast" .)