Certain curfews prisoners might become subject to (5)
I believe the answer is:
incur
'become subject to' is the definition.
(I've seen this in another clue)
'certain curfews prisoners might' is the wordplay.
'INCUR' is hidden within the letters.
But, I'm uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for incur that I've seen before include "Bring something on oneself, often unpleasant" , "Invite, bring about" , "Fall liable to" , "Become subject to (something unpleasant)" , "Become subject to (penalty)" .)