Appreciative, after leaving hotel, for some fuel (7)
I believe the answer is:
tankful
'some fuel' is the definition.
(tank of fuel)
'appreciative after leaving hotel' is the wordplay.
'appreciative' becomes 'thankful' (synonyms).
'after leaving' is a deletion indicator.
'hotel' becomes 'h' (phonetic alphabet: alpha, bravo, charlie etc.).
'thankful' with 'h' removed is 'TANKFUL'.
'for' acts as a link.
(Other definitions for tankful that I've seen before include "Full load of petrol" , "load of fuel" .)