6A - Boxer and professor using some pretty gamy cusswords (6) I have A??C??
23a - Time of greybeard's dropped hand (8) I have E???O?N?
8D - Coleridge wrote his manual (9) I have ??A?E?M??
21D - Ambler's relaxation (6) I have ???O?L (Rex or Eric Ambler ?)