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 before) and 'ploy' is present in the answer.
The remaining letters 'em' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
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" .)