1: Shocks friend overwhelmed by rude slap (7)
4: Mild oath from Yogi about work (7)
7: Dog (cross) exacerbated 16-down (7)
9: Strut about Lands End with a dogs tail? (7)
11: UCLA urea tests involve internationally recognized scientists (9)
13: Lethargic entertainer taking part (5)
15: Drunk held firmly (5)
16: Half-open tomb put in a shrouded form (7)
17: Told fib with particular relaxation (3,4)
19: Whip stuff with energy (5)
20: Fish in sea initially react to heat, perhaps (5)
21: Slows down before a drive in a fast lane (4,5)
22: Bomb compartment - note damaged weapon (7)
24: A drop of the hard stuff? (7)
25: Alien contributed to Journal of Nutrition (7)
26: One wink, or forty (4-3)