Employer's ruse (4)

I believe the answer is:

ploy

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'ruse' is the definition.
(both can mean a trick or scheme)

'employer's' is the wordplay.
'PLOY' is hidden within the letters.
However, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for ploy that I've seen before include "Cunning manoeuvre to gain advantage" , "Ruse or gimmick" , "Ruse, stratagem" , "Device" , "Clever tactic" .)

I've seen this clue in The Mirror.

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