Maker of the wild race on the hill (7)
I believe the answer is:
creator
'maker' is the definition.
(I know that maker can be written as Creator)
'wild race on the hill' is the wordplay.
'wild' indicates anagramming the letters.
'on' says to put letters next to each other (in a down clue, letters appear on others).
'the hill' becomes 'tor' (tor is a kind of hill).
'race' anagrammed gives 'crea'.
'crea'+'tor'='CREATOR'
'of the' acts as a link.
(Other definitions for creator that I've seen before include "Inventor" , "Someone who makes something" , "Originator - God" , "Person who makes or invents things" , "The Almighty" .)