1: Its a firm, small lettuce (3)
3: Incomplete raw data lies in largely unexplored regions (4,7)
8: The king did not stand for it when he heard that he ogles her. (4, 3)
11: Odysseus' first requirement - to catch you like Polyphemus? (3-4)
12: Unarm crook in order to go berserk (3,4)
13: Hearing sis nose around (7)
14: Devil and saint share presentation (13)
18: European sage knew a novel novel (9,4)
20: Climactic age opal tossed (7)
22: Lighter note: tin soldier's back (7)
24: Told about Trotsky hoarding cash (3,2,2)
25: Immerse in massive sound (7)
26: Inspects old radical for a moment (5, 6)
27: Concealed hot part of psyche (3)