One who falsely uses a shock ending in creating fear (5)
I believe the answer is:
faker
'one who falsely uses a' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'shock ending in creating fear' is the wordplay.
'ending' indicates one should take the final letters.
'in' is an insertion indicator.
'creating' indicates anagramming the letters.
The final letter of 'shock' is 'k'.
'fear' is an anagram of 'faer'.
'k' put within 'faer' is 'FAKER'.
Can you help me to learn more?
(Other definitions for faker that I've seen before include "Fraud" , "counterfeiter" .)