Dressed to ride off after a race (7)
I believe the answer is:
attired
'dressed' is the definition.
(I know that dressed can be written as attired)
'ride off after a race' is the wordplay.
'off' indicates an anagram.
'after' means one lot of letters go next to another.
'race' becomes 'tt' ().
'ride' is an anagram of 'ired'.
'a'+'tt'='att'
'ired' after 'att' is 'ATTIRED'.
'to' acts as a link.
(Other definitions for attired that I've seen before include "Wearing clothes" , "Dressed or clothed" , "got up" , "Turned out" , "surrounded by duds" .)