SOLUTION to Roger Squires No. 3397:

Across: 1 Safety catch, 7 Row, 9 Aldis, 10 President, 11 Perpetual, 12 Sauce, 13 Détente, 15 Skin, 18 Iris, 20 Matters, 23 Alibi, 24 Aristotle, 26 Oversight, 27 Aeons, 28 Eft, 29 Sleepwalker. Down: 1 Stampede, 2 Federate, 3 Taste, 4 Capture, 5 Trellis, 6 Hair shirt, 7 Rhesus, 8 Wither, 14 Narcissus, 16 Textbook, 17 Assessor, 19 Spangle, 20 Maintop, 21 Parole, 22 Direct, 25 Tiara.