Related Clues:

• Tit for tat, say?
• Literal result of picking the wrong key
• Password mistake
• A msitake like this
• First of shirts with dirt, say, held up has blurred mark
• Error suppressed by City Police
• Greasy fingerprint, maybe
• This cluef has one
• The Grauniad may be involved in party politics
• Blotch on a phone's screen
• There’s one in this club
• Error in copy taking turnover
• Proofreader's catch, hopefully
• Case of tiny Post Office error in print
• Pretty poetry contains error