Dressed for a race, ride off (7)
I believe the answer is:
attired
'dressed' is the definition.
(I know that dressed can be written as attired)
'a race ride off' is the wordplay.
'race' becomes 'tt'.
'off' is an anagram indicator.
'ride' with letters rearranged gives 'ired'.
'a'+'tt'+'ired'='ATTIRED'
'for' is the link.
(Other definitions for attired that I've seen before include "Turned out" , "surrounded by duds" , "Wearing clothes" , "got up" , "Dressed or clothed" .)