Talk about fuel? (3)
I believe the answer is:
gas
I believe this is a double definition.
'talk' is the first definition.
(I've seen this before)
'fuel?' is the second definition.
(gas is a kind of fuel)
'about' is the link.
(Other definitions for gas that I've seen before include "Oxygen maybe" , "Eg, hydrogen" , "THIRD PART OF 23" , "Domestic fuel" , "Oxygen is one" .)