One working for dictator perhaps using some trusty pistol (6)
I believe the answer is:
typist
'one working for dictator perhaps' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'some trusty pistol' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'TYPIST' is hidden within 'trusty pistol'.
'using' acts as a link.
Can you help me to learn more?
(Other definitions for typist that I've seen before include "One using keyboard" , "Pre-computer office worker" , "One uses an old-fashioned keyboard" , "Keyboard operator" , "Old secretary" .)