Crossword Genius

Island academy in a tree (4)

Ross

I believe the answer is:

guam

'island' is the definition.
(Guam is an example)

'academy in a tree' is the wordplay.
'academy' becomes 'a' (abbreviation for academy).
'in' indicates putting letters inside.
'a tree' becomes 'gum' (gum is a kind of tree).
'a' inserted inside 'gum' is 'GUAM'.

(Other definitions for guam that I've seen before include "NW Pacific island with large US base" , "North Pacific island, base for the US navy and air force" , "Largest of the Mariana Islands" , "US unincorporated territory in the western Pacific" , "Island in the West Pacific" .)

I've seen this clue in the Sydney Morning Herald.
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