Stuck on two clues:
29A: crafty old horse a length behind favourite (only third) 6: XAXXXL
25D: Ehat serpent shows cutting ultimate bit of sour apple 5
MXXIC
Would be grateful for parsing with answers
Many thanks
(with cap) a name for a chestnut horse, esp used proverbially to mean craftiness or cunning, from the deceitful but much-courted horse Fauvel in the 14c French poem Roman de Fauvel.