Carriage contains current king (5)
I believe the answer is:
priam
'king' is the definition.
(I've seen this before)
'carriage contains current' is the wordplay.
I cannot quite understand how this works, but
'current' could be 'i' (symbol for electric current) and 'i' is present in the answer.
'carriage' could be 'pram' (pram is a kind of carriage) and 'pram' is located in the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for priam that I've seen before include "Old king" , "The last king of Troy, in Greek mythology" , "Old man of Paris" , "Ruler of Troy" , "Trojan king" .)