Bear park is halved, therefore (7)
I believe the answer is:
undergo
'bear' is the definition.
(undergoing is a kind of bearing)
'park is halved therefore' is the wordplay.
'park' becomes 'under' (I am not sure about this - if you are sure you should believe this answer much more).
'is halved' suggests halving the letters.
'therefore' becomes 'ergo' (I've seen this before).
'ergo' halved is 'go'.
'under'+'go'='UNDERGO'
Can you help me to learn more?
(Other definitions for undergo that I've seen before include "having to travel by tube" , "put up with" , "Experience or live through" , "Suffer, endure" , "Suffer, experience" .)