Sage, second one to take lead in race (5)
I believe the answer is:
irish
'race' is the definition.
(I've seen this before)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for irish that I've seen before include "of European country" , "Passion" , "Hibernian -- breed of 4" , "From Dublin maybe" , "Native to the Emerald Isle" .)