Related Clues:

• They may be exchanged in anger
• Use thumbs, perhaps
• Sort of cell-phone message
• Send a written message by phone
• Perhaps an annual charge
• Memoir or mystery
• Dictionary content causing an argument
• Novel or novella
• Word with book or box
• '___ fail me'
• Send an emoji, say
• Nabokov dismisses The Van - the one written by the author
• Thumb-typist's message
• A piece of 4 or 19 youth's not completed satisfactorily
• Helpful or distracting thing when studying