Mess duty — my troops ordered to keep volume at a minimum (5-8)

'mess' is the definition.
(thesaurus)

'duty my troops ordered to keep volume at a minimum' is the wordplay.
'ordered' indicates anagramming the letters.
'to keep' means one lot of letters goes inside another.
'at a minimum' says to take the initial letters.
The first letter of 'volume' is 'v'.
'duty'+'my'+'troops'='dutymytroops'
'dutymytroops' is an anagram of 'topsyturydom'.
'topsyturydom' placed around 'v' is 'TOPSY-TURVYDOM'.