Edge clear with this type of fuel? (4-4)

I believe the answer is:

lead-free

'this type of fuel?' is the definition.
(lead-free petrol)

'edge clear' is the wordplay.
'edge' becomes 'lead' (to have the edge is to be in the lead).
'clear' becomes 'free' (similar in meaning).
'lead'+'free'='LEAD-FREE'

'with' is the link.

(Another definition for lead-free that I've seen is " Like most petrol".)

I've seen this clue in The Independent.

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