Cut as we'd misbehaved (5)
I believe the answer is:
sawed
'cut' is the definition.
(I've seen this in another clue)
'as we'd misbehaved' is the wordplay.
'misbehaved' indicates anagramming the letters (I've seen 'misbehaving' mean this).
'as'+'wed'='aswed'
'aswed' with letters rearranged gives 'SAWED'.
(Other definitions for sawed that I've seen before include "Cut with edged tool" , "Cut with a toothed blade" , "Cut through wood" .)