Being true to form after running race (8)
I believe the answer is:
creature
'being' is the definition.
(a creature is a living being)
'true to form after running race' is the wordplay.
'to form' is an anagram indicator.
'after' is a charade indicator (letters next to each other).
'running' is an anagram indicator.
'true' with letters rearranged gives 'ture'.
'race' is an anagram of 'crea'.
'ture' after 'crea' is 'CREATURE'.
(Other definitions for creature that I've seen before include "Living being" , "Bird, beast, insect etc" , "Human being or lower animal" , "Any organism with voluntary movement" , "Animal or person" .)