Flashy fellow lacking humanity (5)
I believe the answer is:
robot
'flashy fellow lacking humanity' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'fellow lacking humanity' is the wordplay.
'fellow' becomes 'ron' (masculine given name).
'lacking' means to remove the last letter (the word is incomplete or lacking).
'humanity' becomes 'bot' (I am not sure about this - if you are sure you should believe this answer much more).
'ron' with its final letter taken off is 'ro'.
'ro'+'bot'='ROBOT'
Can you help me to learn more?
(Other definitions for robot that I've seen before include "Mechanical worker" , "programmed servant" , "Soulless worker" , "Automation" , "Programmed machine" .)