Crossword Genius

What a cart uses, going up to the King's Head? (5)

Ross

I believe the answer is:

track

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'head?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'what a cart uses going up to the king's' is the wordplay.
'what a cart uses' becomes 'car' (I can't justify this - if you can you should believe this answer much more).
'going up' says the letters should be written backwards (in a down clue, the letters are written upwards).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'king' becomes 'K' (chess abbreviation).
'car' written backwards gives 'rac'.
'rac' after 't' is 'trac'.
'trac'+'k'='TRACK'

Can you help me to learn more?

(Other definitions for track that I've seen before include "Follow < course" , "Way" , "Mark of passage" , "Sign that one's passed" , "Number on CD" .)

I've seen this clue in the Evening Standard.
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