Praise a former disorderly lot (5)
I believe the answer is:
extol
'praise' is the definition.
(I know that extol is a more specific form of the action praise)
'a former disorderly lot' is the wordplay.
'a former' becomes 'ex' (prefix meaning former or onetime).
'disorderly' is an anagram indicator.
'lot' is an anagram of 'tol'.
'ex'+'tol'='EXTOL'
(Other definitions for extol that I've seen before include "Applaud" , "Laud; glorify" , "Highly rate" , "Speak well of" , "Glorify - honour" .)