Law enforcement staff including one Charlie (6)
I believe the answer is:
police
'law' is the definition.
(synonyms)
'staff including one charlie' is the wordplay.
'staff' becomes 'pole' (both can mean a stick).
'including' means one lot of letters goes inside another.
'one' becomes 'i' (Roman numeral).
'charlie' becomes 'C' (phonetic alphabet).
'i'+'c'='ic'
'pole' enclosing 'ic' is 'POLICE'.
'enforcement' acts as a link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for police that I've seen before include "... custodians of law and order" , "Monitor; control" , "Bobby" , "Nick" , "Law enforcers" .)