Fancy Chelsea tractor leaving street to get fuel (8)
I believe the answer is:
charcoal
'fuel' is the definition.
(I know that charcoal is a type of fuel)
'fancy chelsea tractor leaving street' is the wordplay.
'fancy' indicates anagramming the letters.
'leaving' indicates named letters should be taken away.
'chelsea'+'tractor'='chelseatractor'
'chelseatractor' with 'street' removed is 'chlaacor'.
'chlaacor' with letters rearranged gives 'CHARCOAL'.
'to get' acts as a link.
(Other definitions for charcoal that I've seen before include "Fuel eg for barbecue" , "Fuel - very dark grey" , "Fuel used for drawing" , "Form of carbon for drawing" , "Dark grey colour" .)