A little bonsai on Asian island (4)

I believe the answer is:

iona

'island' is the definition.
(Scottish island)

'a little bonsai on asian' is the wordplay.
'a little' says the answer is hidden in the clue.
'IONA' is hidden in the letters of 'bonsai on asian'.

(Other definitions for iona that I've seen before include "small island" , "Holy island" , "Greek sea god" , "Scots monastery isle" , "'Hebridean island, early centre of Celtic Christianity (4)'" .)

I've seen this clue in The Telegraph.

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