Possible Clues:

• and 24 Across: The original unfed bird's in for it -- this 21 snack her downfall
• I moved to the left in brave, spirited church government
• Pro got excited in bed with head of department - that's not allowed!
• The sound of the band was not aloud, by the sound of it
• Out of bounds, like Wheatley's territory
• Because you ask to have a room, is vetoed
• Disallowed, banned
• Prohibited, taboo
• Not allowed in Bedford after work
• Foreign Office ordered to tackle Republican taboo