1: Hesper's fresh fields (7)
5: Without a bit of Retin-A, stops wrinkles (7)
8: Birds lay first of eggs on parts of shoelaces (7)
9: Alien put in L.A. marriage (7)
11: Celebration geared for retirement (6,5)
13: Uninitiated stoop to finish (3)
14: Split particle following before (7)
16: Bring on trendy dog (5)
18: Valuable coat of arms positioned (5)
19: Mr. Upton dressed, one suit being just like any other? (2-5)
21: Clean oneself, but in reverse (3)
23: Playwright rethinking copyright wrangle (4,7)
25: Keep rolling and swelling, Doc! (7)
26: Chosen one renders deer fat (7)
27: Frank turned brown sitting on mountains (7)
28: The control is over that way (7)