Not the complete CID man (3)
I believe the answer is:
tec
'not' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'the complete cid man' is the wordplay.
'the' becomes 't' (the is pronounced as a 't' sound in some dialects).
'complete cid man' becomes 'ec' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
't'+'ec'='TEC'
Can you help me to learn more?
(Other definitions for tec that I've seen before include "Busy" , "CID officer (abbrev.)" , "Detective (colloq.)" , "Investigator" .)