Host running one way and another (3,2)
I believe the answer is:
put up
'host' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for put up that I've seen before include "Nominate for election" , "lodge" , "Provide a bed for the night" , "Give accommodation to" , "Accommodate; erect" .)