Overload current charging motor (4)
I believe the answer is:
taxi
'motor' is the definition.
(thesaurus)
'overload current charging' is the wordplay.
I cannot quite understand how this works, but
'current' could be 'i' (symbol for electric current) and 'i' is located in the answer.
The remaining letters 'tax' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for taxi that I've seen before include "At airport, guide" , "move on ground before take-off" , "Motor vehicle by rank?" , "(Of a plane) move slowly on the ground" , "people carrier?" .)