Type of race put down again (5)
I believe the answer is:
relay
I believe this is a double definition.
'type of race' is the first definition.
(relay race)
'put down again' is the second definition.
('lay' is an answer for 'put down' so perhaps 'relay' is OK for 'put down again')
(Other definitions for relay that I've seen before include "Team of workers" , "Hand, pass on" , "track event" , "supplementary store of anything" , "Pass on - put down again" .)