Jury studying penal reform (5)
I believe the answer is:
panel
'jury' is the definition.
(synonyms)
'studying penal reform' is the wordplay.
'penal' anagrams to 'PANEL'.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for panel that I've seen before include "a selection of which is put in box" , "Group of experts etc" , "Board for instruments" , "- Game; - saw; - pin" , "Instrument board; investigating group" .)