1: Its a firm, small lettuce (3)
4: Mountain gorilla captivated Scientific American (9)
8: One true turning on the way (2,5)
9: Heading off with child leading (7)
11: Offering advice, King takes over one bit, zany initially (9)
12: Clean oneself, but in reverse (3)
13: Fresh ardor mellows outbursts on the highway (4,5)
15: Pinker and harder to find (5)
17: Centre of diamond is shrouded in fog (5)
18: Left sheet in case (9)
20: Scale Ten after taxes (3)
22: Grasp a rag usefully wrapping vegetable (9)
23: Church conceals torture instrument before king; it could be explosive. (7)
24: Lighter note: tin soldier's back (7)
25: Mongrels at each others' throats in this ruthless world. (3, 3, 3)