Gas and endless solid fuel for hot drink (5)
I believe the answer is:
cocoa
'hot drink' is the definition.
(I've seen this before)
'gas and endless solid fuel' is the wordplay.
'gas' becomes 'co' (CO is carbon monoxide).
'and' is a charade indicator (letters next to each other).
'endless' means to remove the last letter.
'solid fuel' becomes 'coal' (I've seen this before).
'coal' with its last letter taken away is 'coa'.
'co'+'coa'='COCOA'
'for' is the link.
(Other definitions for cocoa that I've seen before include "product of beans!" , "Chocolaty drink" , "Medium to dark brown" , "Chocolate powder" , "drink from beans" .)