Duck I left because it’s a bit greasy (3)

I believe the answer is:

oil

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'because it's a bit greasy' is the definition.
I can't tell whether this defines the answer.

'duck i left' is the wordplay.
'duck' becomes 'o'.
'left' becomes 'l' (common abbreviation).
'o'+'i'+'l'='OIL'

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(Other definitions for oil that I've seen before include "Fossil fuel" , "Anoint" , "Viscous substance as lubricant" , "Fluid lubricant" , "Slippery liquid" .)

I've seen this clue in the Evening Standard.

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