Fertilise developing plant with Eastern oil (9)

I believe the answer is:

pollinate

'fertilise' is the definition.
(I've seen this before)

'developing plant with eastern oil' is the wordplay.
'developing' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'eastern' becomes 'e'.
'e'+'oil'='eoil'
'plant' put after 'eoil' is 'eoilplant'.
'eoilplant' with letters rearranged gives 'POLLINATE'.

(Another definition for pollinate that I've seen is " Fertilise (flower)".)

I've seen this clue in The Independent.

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