What Yahoo initially requires from typist? That's devious (6)
I believe the answer is:
shifty
'that's devious' is the definition.
(I've seen this in another clue)
I don't understand how the remainder of the clue works.
(Other definitions for shifty that I've seen before include "Sneaky and sly" , "Sly, shady" , "Suspicious-looking" , "Constantly changing; deceitful, evasive" , "Unreliable" .)