Flashy fellow, conceivably with a screw loose? (5)
I believe the answer is:
robot
'screw loose?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for robot that I've seen before include "Automation" , "Programmable machine" , "Automatic machine" , "Mechanical worker" , "Humanoid machine" .)