Object about overhasty corporal punishment (9)
I believe the answer is:
thrashing
'corporal punishment' is the definition.
(thrashing is a kind of corporal punishment)
'object about overhasty' is the wordplay.
'object' becomes 'thing' (an object is a thing or item).
'about' indicates putting letters inside.
'overhasty' becomes 'rash' (I've seen this in another clue).
'thing' enclosing 'rash' is 'THRASHING'.
(Other definitions for thrashing that I've seen before include "A very heady defeat" , "beating" , "Hiding" , "punishment" .)