Based on the clue 'a letter of the alphabet or ones former spouse', what is the answer?

Based on the clue 'a letter expressing thanks for hospitality is name...', what is the answer? Based on the clue 'a letter from einstein to fdr is on display at the...', what is the answer? Based on the clue 'a letter like p or d where some part of the mouth ...', what is the answer? Based on the clue 'a letter of introduction from this winesburg ohio ...', what is the answer? Based on the clue 'a letter of this to a prospective employer outline...', what is the answer? Based on the clue 'a letter plus a word make this steak from the shor...', what is the answer? Based on the clue 'a letter to this person like ben bradlee should ra...', what is the answer? Based on the clue 'a level of stability or a relatively flat surface', what is the answer?