Drop an ugly misbehaving group of children here (10)
I believe the answer is:
playground
'group of children here' is the definition.
(a group of children might play in a playground)
'drop an ugly misbehaving' is the wordplay.
'misbehaving' indicates an anagram.
'drop'+'an'+'ugly'='dropanugly'
'dropanugly' with letters rearranged gives 'PLAYGROUND'.
(Other definitions for playground that I've seen before include "Recreational area" , "amusement venue" , "kids' recreation area" .)