Under fruit of the highest nature (7)

I believe the answer is:

sublime

I'm a little stuck... Click here to teach me more about this clue!

'under fruit of the highest nature' is the definition.
I can't tell whether this defines the answer.

'under fruit' is the wordplay.
'under' becomes 'sub' (I've seen this before).
'fruit' becomes 'lime' (lime is a kind of fruit).
'sub'+'lime'='SUBLIME'

Can you help me to learn more?

(Other definitions for sublime that I've seen before include "Majestic" , "Unparalleled, extreme" , "Wonderful" , "Transcendent" , "Exalted; awesome" .)

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

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