Trident found in the road (4)
I believe the answer is:
fork
'trident' is the definition.
(thesaurus)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for fork that I've seen before include "Garden tool" , "Tool with tines" , "Threaten bishops with queen, say" , "(Path) split into two" , "Split in road" .)