Crossword Genius

On isle, leave healthy food (9)

Ross

I believe the answer is:

mangetout

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'healthy food' is the definition.
I know nothing about this answer so I can't tell whether this works.

'on isle leave' is the wordplay.
'on' says to put letters next to each other.
'isle' becomes 'man' (the Isle of Man is an example).
'leave' becomes 'getout' (synonyms).
'man' next to 'getout' is 'MANGETOUT'.

Can you help me to learn more?

(Other definitions for mangetout that I've seen before include "Type of pea" , "Vegetable" , "From this pod" , "vegetables" , "something on the plate" .)

I've seen this clue in The Guardian.
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