He works with all sorts of types (7)
I believe the answer is:
printer
'he works with all sorts of types' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
This is all the clue.
Can you help me to learn more?
(Other definitions for printer that I've seen before include "one making an impression?" , "See 13 Down" , "who makes an impression" , "eg Typesetter" , "Producer of reading material" .)