Newspaper worker, sort superior to crossword writer (10)
I believe the answer is:
typesetter
'newspaper worker' is the definition.
'typesetter' can be an answer for 'worker' (typesetter is a kind of worker). I am not sure about the 'newspaper' bit.
'sort superior to crossword writer' is the wordplay.
'sort' becomes 'type' (type is a kind of sort).
'superior to' is a charade indicator (letters next to each other) (in a down clue, some letters go above others).
'crossword writer' becomes 'setter' (I can't justify this - if you can you should give a lot more credence to this answer).
'type'+'setter'='TYPESETTER'
Can you help me to learn more?
(Other definitions for typesetter that I've seen before include "Former newspaper employee" , "Press worker" , "Old newspaper producer" , "whose work will leave a lasting impression?" , "One doing composition" .)