Possible Clues:

• English radical taking overdose crumbled away
• Eaten away, like the first words of 17-, 31-, 48- and 65-Across in order?
• Worn down by deed or action
• Journalist admits staff morale finally is worn down
• Like the Grand Canyon's walls
• Like a seacoast after a storm, maybe
• Journalist admits staff morale ultimately is worn down
• Lost deposits, as a bank?
• French illustrator upset editor, was abrasive
• Blown away?