Keyboard whiz (6)
I believe the answer is:
typist
'keyboard whiz' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for typist that I've seen before include "One using keyboard" , "Operator of a machine that prints one character at a time" , "Key worker" , "Pre-computer office worker" , "One uses an old-fashioned keyboard" .)