Could that man begin making chaos? (6)
I believe the answer is:
mayhem
'chaos?' is the definition.
(I've seen this before)
'could that man begin making' is the wordplay.
'could' becomes 'may' (I've seen this before).
'that man' becomes 'he' ('he' refers to a man).
'begin' indicates taking the first letters.
The first letter of 'making' is 'm'.
'may'+'he'+'m'='MAYHEM'
(Other definitions for mayhem that I've seen before include "Much trouble when" , "violence" , "Violent or damaging action, a crime" , "Violent destruction of confusion" , "wilful infliction of injury" .)