Fuel used in that race somehow (10)
I believe the answer is:
anthracite
'fuel' is the definition.
(I know that anthracite is a type of coal)
'in that race somehow' is the wordplay.
'somehow' indicates anagramming the letters.
'in'+'that'+'race'='inthatrace'
'inthatrace' with letters rearranged gives 'ANTHRACITE'.
'used' acts as a link.
(Other definitions for anthracite that I've seen before include "Hard type of coal" , "Hard variety of coal" , "kind of fuel" , "High-grade hard coal" .)