At many a racing venue, it's considered lucky (6)
I believe the answer is:
'considered lucky' is the definition.
I know that 'lucky' relates to this answer.
'at many a racing venue' is the wordplay.
'at' is a charade indicator (letters next to each other).
'many' becomes 'm' (Roman numeral for a thousand).
'a racing venue' becomes 'ascot' (English race course).
'm' next to 'ascot' is 'MASCOT'.
'it's' is the link.
Can you help me to learn more?
(Other definitions for mascot that I've seen before include "Symbolic figure, for a team say" , "Team's good-luck bringer" , "Symbolic lucky figure" , "Thing believed to bring good luck, perhaps to team" , "Thing supposed to bring good luck" .)