Crossword Genius

Use a tricky device that gets me upset (6)

Ross

I believe the answer is:

employ

I'm a little stuck... Click here to teach me more about this clue!

'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" .)

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