Pity's aroused by tense key worker (6)
I believe the answer is:
typist
'key worker' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for typist that I've seen before include "Operator of a machine that prints one character at a time" , "Person at keyboard" , "Pre-computer office worker" , "Old secretary" , "Forerunner of the word processor operator" .)