* Divine princess dropped source of it (4)

I believe the answer is:

vine

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'source of it' is the definition.
I can't judge whether this definition defines the answer.

'divine princess dropped' is the wordplay.
'princess' becomes 'di' (Princess Diana).
'dropped' indicates named letters should be taken away.
'divine' with 'di' taken out is 'VINE'.

Can you help me to learn more?

(Other definitions for vine that I've seen before include "On which grapes grow" , "Climbing, twining plant" , "Plant producing grapes" , "Grape plant" , "Woody-stemmed climber" .)

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

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