Fuel price finally dropped (4)
I believe the answer is:
feed
'fuel' is the definition.
(thesaurus)
'price finally dropped' is the wordplay.
'price' becomes 'fee' (I've seen this in other clues).
'finally' suggests the final letters.
The final letter of 'dropped' is 'd'.
'fee'+'d'='FEED'
(Other definitions for feed that I've seen before include "Give (or take) nourishment" , "Nourish" , "comedian's assistant" , "Straight man" , "Eat; pass (a ball) to another player" .)