Disciplinary panel perhaps (5)
I believe the answer is:
penal
'disciplinary' is the definition.
(I've seen this in another clue)
'panel perhaps' is the wordplay.
'perhaps' indicates an anagram.
'panel' with letters rearranged gives 'PENAL'.
(Other definitions for penal that I've seen before include "Punitive" , "Deliberately unpleasant" , "Very severe" , "Involving legal punishment" , "Relating to legal punishment" .)