Use a tricky device that gets me upset (6)
I believe the answer is:
employ
'use' is the definition.
(synonyms)
'a tricky device that gets me upset' is the wordplay.
I cannot quite see how this works, but
'device' could be 'ploy' (I've seen this in another clue) and 'ploy' is found within the answer.
The remaining letters 'em' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for employ that I've seen before include "Draw on" , "Occupy" , "occupation" , "Utilize" , "Make use of" .)