Wouldn't stop princess antagonising prisoners (9)

I believe the answer is:

incessant

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'wouldn't stop princess antagonising prisoners' is the definition.
I can't judge whether this definition defines the answer.

'wouldn't stop princess antagonising prisoners' is the wordplay.
'INCESSANT' is hidden in amongst the letters.
However, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for incessant that I've seen before include "Never-ending" , "Endless" , "happening all the time" , "Nine casts (anag) - nonstop" , "Without pausing" .)

I've seen this clue in The Irish Times.

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