Prisoner's word often used on board (6)

I believe the answer is:

parole

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'prisoner's word' is the definition.
'parole' can be an answer for 'word' (synonyms). I'm not certain of the 'prisoner's' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for parole that I've seen before include "Release (a prisoner) on the promise of good conduct" , "Release of prisoner promising good behaviour" , "Conditionally release" , "Promise (that prisoner is released on)" , "Early conditional release for prisoner in jail" .)

I've seen this clue in the Evening Standard.

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