Possible Clues:

• Rival to nice little Italian lake outside Roman capital
• Company making top favourite cocktail ingredient alternative for rival
• Cold changing room accommodates little Parisian rival
• Rival clubs locking small Parisian in changing room
• Sporting contest entrant
• Player with little French put into cold changing room
• Entrant in race scheming to crop time
• Knock down price -- motto of rival trader?
• Rival clubs promote changes covering it
• Rival school's tie twisted round bunk