1: Navaho sing of Five Rings coming clean (6,3)
2: Junker left Alaskan city heading north (5)
3: Sing out, holding scale notes in European city (7)
4: Crate shaken a bit (5)
5: Sycophant of knowledge, essentially, in those scoring 1600? (9)
6: What's left when you burn the tree (3)
7: Recycled output for larger hollow tree within (4,5)
10: Help found in Adelaide. (3)
12: See, you are a cad. (3)
14: Turn over extra-strange IRS filing (3,6)
16: Dirty Targa term is a four-letter word (9)
17: Top colleges have three miles of vine (3,6)
19: Fish spawn upstream in little orifices (3)
20: Sarah has friends from France on a Greek island (7)
22: Rohmer hiding unit of Resistance (3)
24: Stay in the air? But we're lost! (5)
25: Odd bits of Niacin and Sprite (5)