Stop pressurising participants; you'll overwhelm them (7)

I believe the answer is:

oppress

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'you'll overwhelm them' is the definition.
I can't tell whether this definition defines the answer.

'stop pressurising participants' is the wordplay.
'participants' says the answer is hidden in the clue (some letters 'participating' in the clue).
'OPPRESS' can be found hidden inside 'stop pressurising'.

Can you help me to learn more?

(Other definitions for oppress that I've seen before include "Govern cruelly" , "Hold down cruelly" , "Bear down hard on" , "Afflict" , "Treat tyrannically" .)

I've seen this clue in The Irish Times.

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