Crossword Genius

Cadet agency recruits retired, wiped out (7)

Ross

I believe the answer is:

negated

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

'wiped out' is the definition.
Although both the answer and definition are past participle verbs, I don't understand how they can define each other.

'cadet agency recruits retired' is the wordplay.
'NEGATED' is hidden back-to-front within the letters.
But, I am uncertain how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for negated that I've seen before include "Made ineffective" , "Nullified" , "Abrogated" , "Cancelled or destroyed the effect of something" , "Denied" .)

I've seen this clue in the Sydney Morning Herald.
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