Race official saw red, mad about leader in Toyota (7)
I believe the answer is:
steward
'race official' is the definition.
(I've seen this before)
'saw red mad about leader in toyota' is the wordplay.
'mad' indicates anagramming the letters.
'about' is an insertion indicator.
'leader in' indicates taking the first letters.
The initial letter of 'toyota' is 't'.
'saw'+'red'='sawred'
'sawred' is an anagram of 'seward'.
'seward' going around 't' is 'STEWARD'.
(Other definitions for steward that I've seen before include "Attendant on plane or ship" , "Racing official" , "Shipboard attendant" , "Crowd-control official" , "Horse-racing official" .)