Related Clues:

• Partly how one makes one's mark
• Butchers notoriously miss this change of direction in address
• Perhaps too bad a mark
• Sort of speech perhaps too sloppy
• Mark redeployed as organisation's first prophet
• Character from Côte-d'Or?
• Perhaps too haphazardly, it may be misplaced by shopkeeper?
• Spare photo (anag.)
• Rhetorical device in short stanza penned by American Gothic writer
• Transported pear to shop -- might this confuse greengrocer?
• A mail line including hotel’s address
• It's often inserted in error, perhaps too inanely
• Mark similar to 18, but higher