2a - A five-letter American alternative for 'pavements', beginning with P ('Sidewalks') around ('fringing') the five-letter name of a very famous Irish steeplechaser from the 1960s ('legendary mount').
9d - A three-letter word meaning 'opposed to' (often seen in crosswords), plus a common four-letter word for a team, plus a less common (chiefly Scottish, according to Chambers) five-letter word for a bar (beginning R).
Hope that helps!