1: Giant reptiles make a racket and love southern gold, but principally really stink! (9)
4: Witticism provided theme (5)
7: Central section interrupting main tune (7)
9: Partially remodel attic, extending framework (7)
10: Apprentice number six, to Spanish aunt, extremely tentative (9)
12: Very bad, but permissible, to dismiss counsel, ultimately (5)
13: Wanderer features in ones best adage (7)
14: Proper wordplay describing actress Moreno (7)
16: Spot stick-in-the-mud Republican with fan (7)
17: Attribute for a document copier (7)
18: Verne's incredible chutzpah (5)
20: Columbine takes stage during repeated Iolanthe opening, in blue-green (9)
22: Where junior diplomats are sent to spout off (7)
24: Avoid duty like a self-satisfied leg-puller (7)
25: Great crowd spirit (5)
26: Took exception to insult and discharged editor (9)