28a. 10 letters.. callus way for racegoers to describe a terrific turn of foot, perhaps. - - - - - e - i -g
8a. a chara. 4 letters - a e. Is it mate?
5d. 2 words. set the fourth estate at liberty.
6d one obstacle to negotiate. is it last step? its 2 words.
19d. 8 letters. without purpose. - no net gains
thanks in advance