1: Where junior diplomats are sent to spout off (7)
4: Screams Yes! around line 50 (5)
8: A representative may be a scamp (3)
10: Leaving firm when dating (5,6)
11: . . . or working with one group of stars (5)
12: UCLA urea tests involve internationally recognized scientists (9)
14: Try place for field event (4,3)
16: Mr. Sharpton's under canvas singing and dancing? (7)
17: Quiet decor back, embracing open encouragement to move forward (7)
19: Carrier's gotta be upset (4,3)
21: Long Rhine sequence in Wagner's work (9)
22: $100 accepted by tart in buff (5)
23: Farmyard creatures defining an unlikely story? (4,3,4)
25: Implement box for young cat (3)
26: Biblical refugee, American flower (5)
27: They can't reproduce sounds like an operating system (7)