In Hull, city racecourse for chariots (10)
I believe the answer is:
hippodrome
'racecourse for chariots' is the definition.
I can't judge whether this definition defines the answer.
'in hull city' is the wordplay.
'in' becomes 'hip' (both can mean fashionable).
'hull' becomes 'pod' (both can mean a case or shell).
'city' becomes 'rome' (Rome is an example).
'hip'+'pod'+'rome'='HIPPODROME'
Can you help me to learn more?
(Other definitions for hippodrome that I've seen before include "old track" , "Chariot racetrack" , "Theatre (originally for horse racing)" , "Circus" , "Stadium for horse shows or horse races" .)