Earlier extract of petrol, derv, etc. (5)

I believe the answer is:

older

'earlier' is the definition.
('old' can be similar in meaning to 'early')

'extract of petrol derv etc' is the wordplay.
'extract of' indicates the answer is hidden within the clue (I've seen this in other clues).
'OLDER' is hidden in the letters of 'petrol derv etc'.

(Other definitions for older that I've seen before include "Getting on" , "Of greater age (O, not E)" , "More ancient" , "Elder" , "More aged" .)

I've seen this clue in the Evening Standard.

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