1: Ultimately develop top demonstration (5)
3: Bluff included in reckless dare in ivy league college (9)
8: Me in a green tent's ultimate in harmony (9)
10: Exegesis of clue an idiot misunderstood (11)
12: Irish playwright livin soundly (5)
13: Child is to depart, finally (3)
14: A vine sometimes can seem green (5)
15: Group of eight initially outwits coup to enter Tripoli (5)
17: Chain some; cuff objectors (3)
19: Failure to remember Bach work (5)
21: Residue has scattered (3)
22: 27-across about starting off 1-down world unconditionally (2,3,2,4)
23: Frost to cover the cake (3)
24: Under no circumstances should you take a worker from a bean-counter following his little number. (2, 7)
25: Tess spied wrinkled skirts (9)
26: Thick maple growing wild (5)