Lucky number at a racing venue (6)
I believe the answer is:
mascot
'lucky' is the definition.
The definition and answer are not the same part of speech. However, I know that 'lucky' relates to this answer.
'number at a racing venue' is the wordplay.
'number' becomes 'M' (M is an example).
'at' is a charade indicator (letters next to each other).
'a racing venue' becomes 'ascot' (English race course).
'm'+'ascot'='MASCOT'
Can you help me to learn more?
(Other definitions for mascot that I've seen before include "Bringer of good luck to team, etc" , "Charm - talisman" , "Thing believed to bring good luck to its owner or team" , "Something bringing luck" , "good luck charm required" .)