Dalibor's talent stopped by prison (7)
I believe the answer is:
borstal
'prison' is the definition.
(thesaurus)
'dalibor's talent stopped by' is the wordplay.
'stopped by' indicates a hidden word (the answer fills or 'stops' a gap in the clue).
'BORSTAL' is hidden within 'dalibors talent'.
(Other definitions for borstal that I've seen before include "Formerly, prison for young offenders" , "Detention centre" , "Old institution" , "Former youth prison" , "Former detention establishment" .)