Follow carriage heading north with king (5)
I believe the answer is:
track
'follow' is the definition.
(thesaurus)
'carriage heading north with king' is the wordplay.
'carriage' becomes 'cart'.
'heading north' shows that the letters should be reversed in order.
'with' is a charade indicator (letters next to each other).
'king' becomes 'k'.
'cart' reversed gives 'trac'.
'trac'+'k'='TRACK'
(Other definitions for track that I've seen before include "One of the songs on CD?" , "Lines" , "Pathway" , "Course over which races are run" , "Mark of passage" .)