Plant fuel - film planned on it (7)

I believe the answer is:

milfoil

'plant' is the definition.
(I know that milfoil is a type of achillea)

'fuel film planned on it' is the wordplay.
'fuel' becomes 'oil' (oil is a type of fuel).
'planned' indicates anagramming the letters.
'on it' means one lot of letters go next to another.
'film' is an anagram of 'milf'.
'oil' put after 'milf' is 'MILFOIL'.

(Another definition for milfoil that I've seen is " Common wasteland plant - film oil (anag)".)

I've seen this clue in The Independent.

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