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' is a deletion indicator.
'concluded' becomes 'over' (synonyms).
'coverage' with 'over' taken out 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)" .)