Prohibiting report about pub that’s turned up (7)

'prohibiting' is the definition.
(banning is a kind of prohibiting)

'report about pub that's turned up' is the wordplay.
'report' becomes 'bang' (I've seen this before).
'about' means one lot of letters goes inside another.
'pub' becomes 'inn' (an inn is a type of pub).
'that's turned up' says the letters should be written in reverse.
'inn' backwards is 'nni'.
'bang' going around 'nni' is 'BANNING'.