Policeman is wicked, mean and crooked (not the first) (14)
I believe the answer is:
superintendent
'policeman' is the definition.
(thesaurus)
'wicked mean and crooked not the first' is the wordplay.
I cannot really understand how this works, but
'wicked' could be 'super' (I've seen this before) and 'super' is present in the answer.
'mean' could be 'intend' (to intend to something is to mean it) and 'intend' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is present in the answer.
A single letter 'e' remains which might be clued in a way I don't see.
This explanation may well be incorrect...
'is' acts as a link.
(Other definitions for superintendent that I've seen before include "Overseer; police officer" , "Police rank" , "Police chief" , "Senior police officer" , "One who is in charge of an organisation" .)