What brings luck millions wanted at racecourse (6)
I believe the answer is:
mascot
'what brings luck' is the definition.
I can't judge whether this definition defines the answer.
'millions wanted at racecourse' is the wordplay.
'millions' becomes 'm' (abbreviation).
'wanted at' says to put letters next to each other.
'racecourse' becomes 'ascot' (British racecourse).
'm'+'ascot'='MASCOT'
Can you help me to learn more?
(Other definitions for mascot that I've seen before include "One for good luck" , "Luck-bringer" , "Good-luck item" , "It is believed to bring good luck to its owner(s)" , "Thing considered to bring good luck" .)