1: Sound of river crossing (3)
3: Cereal vermin seized by superb 16-down (11)
9: Bad blood from taking head off to slay William (3,4)
11: Blamed and nailed copper, scam's leader on the inside (7)
12: National official is here, carrying identification, after challenge overwhelms local center (4-9)
14: One hero, perhaps! (7)
15: Legendary rich guy gets called, then folds (7)
16: Our tree worked out how to send out in another way (7)
18: Hikers' path around Virginia is hard work (7)
21: Tint bark clogs to provide foot support (8,5)
23: May start to get sick? Catch postal container (7)
24: Coarse Nicaraguan conceals a dangerous element (7)
25: Person with fixed notions is pretty sore, upset about the introduction of Ebonics (11)
26: Beauty stripping top and bottom is an additional feature (3)