Hushing up punishment (6)
I believe the answer is:
hiding
I believe this clue is a double definition.
'hushing up' is the first definition.
(I've seen this before)
'punishment' is the second definition.
(I have seen 'physical punishment' mean 'hiding' so perhaps 'punishment' could also mean 'hiding')
(Other definitions for hiding that I've seen before include "Secreting" , "Beating - state of concealment" , "Trying to avoid" , "Evading capture," , "going underground" .)