1: Rebs to can fresh edible crustacean from southern states (5,4)
2: Foresees a three iron, just as Cassandra did. (7, 6)
3: Cold medicine's secret ingredients (7)
4: More pronounced rasp (7)
5: Point back to itself. (5)
6: Damsels primarily enthralled by romances in forests (5)
8: Climactic age opal tossed (7)
10: Cat linked stories to the underworld (8-5)
14: Napoleonic site on Web is reactionary, very likely (7)
17: Birth of Wilder sibling (7)
18: Knot a rope in the great out-of-doors (4-3)
19: Dance, Father Morrison? (5)
20: Monday spent in thought (5)