Race to put down again (5)
I believe the answer is:
This clue is a double definition.
'race' is the first definition.
'put down again' is the second definition.
('lay' can be a synonym for 'put down' so perhaps 'relay' is OK for 'put down again')
'to' acts as a link.
(Other definitions for relay that I've seen before include "supplementary store of anything", "Broadcast", "Team of workers", "Pass on - put down again", "article in bank".)