Going to ground, getting beating (6)
I believe the answer is:
hiding
I believe this is a double definition.
'going to ground' is the first definition.
(to go to ground is to go into hiding)
'beating' is the second definition.
(I've seen this before)
'getting' is the link.
(Other definitions for hiding that I've seen before include "big defeat" , "Thrashing; lying low" , "Concealment - punishment" , "Beating; severe defeat" , "Evading capture," .)