Passes on races between teams (6)
I believe the answer is:
relays
I believe this is a double definition.
'passes on' is the first definition.
(I've seen this before)
'races between teams' is the second definition.
(I've seen this before)
(Other definitions for relays that I've seen before include "Races with team members who pass a baton" , "Passes on a message" , "Races featuring running teams and baton passing" , "Receives and passes on" , "Rebroadcasts" .)