Prison reporting not concluded (4)
I believe the answer is:
cage
'prison' is the definition.
(cage is a kind of prison)
'reporting not concluded' is the wordplay.
'reporting' becomes 'coverage' (synonyms).
'not' indicates named letters should be taken away.
'concluded' becomes 'over' (synonyms).
'coverage' with 'over' removed is 'CAGE'.
(Other definitions for cage that I've seen before include "Prison for 21" , "Barred structure" , "Barred enclosure for animals" , "American composer with centenary this year" , "Prison (with bars)" .)