He makes a false impression (6)
I believe the answer is:
forger
'he makes a false impression' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is the entire clue.
Can you help me to learn more?
(Other definitions for forger that I've seen before include "Ironworker" , "Maker of false bank notes" , "Criminal who makes dud bank notes" , "who makes money illegally?" , "Maker of false bank-notes" .)