I need tea prepared for prisoner (8)
I believe the answer is:
detainee
'prisoner' is the definition.
(detainee is a kind of prisoner)
'i need tea prepared' is the wordplay.
'prepared' indicates anagramming the letters.
'i'+'need'+'tea'='ineedtea'
'ineedtea' with letters rearranged gives 'DETAINEE'.
'for' acts as a link.
(Other definitions for detainee that I've seen before include "One held in custody" , "One is held under guard, for political reasons perhaps" , "confined person" , "Prisoner" , "Someone held in custody" .)