Prohibit this writer returning to tavern and leave (7)
I believe the answer is:
embargo
'prohibit' is the definition.
(I know this)
'this writer returning to tavern and leave' is the wordplay.
'this writer' becomes 'me' (the person who is writing these clues).
'returning' says the letters should be written backwards.
'to tavern' becomes 'bar' (I've seen this in another clue).
'and' is a charade indicator (letters next to each other).
'leave' becomes 'go' (to go is to depart or leave).
'me' in reverse letter order is 'em'.
'em'+'bar'+'go'='EMBARGO'
(Other definitions for embargo that I've seen before include "Government order imposing a trade barrier" , "Trade sanction" , "Prohibit" , "Ban or restraint on trade" , "Trade barrier or publication ban" .)