Related Clues:

• Impossible task for goon
• Can't be done, not on
• Area forbidden to certain groups, maybe police
• Entry to this area is forbidden (2-2)
• Prevented progress
• Completely obstructed or closed off
• Area to which access is prevented, by paramilitaries, say
• The sort of area that will stop a goon getting confused
• Scuttled
• Canceled ... or a hint to answering 17-, 27-, 34-, 45- and 57-Across
• Drink nothing! That would be futile!
• Cancelled rocket launch, e.g
• Don¿t say yes to progress in forbidden area
• Scrubbed, at 7 Down
• Red light perhaps in forbidden district