20 across: Wicked climber corks key bubbly with bit of tissue (9)
Corks key bubbly = skyrocke and bit of tissue = t so that wicked climber = skyrocket = corks key bubbly with bit of tissue. Here, the explanation is reasonably easy, but the direct clue is a piece of crap. Wicked climber for skyrocket is too ridiculous a synonym even for a cryptic.
Update: In the comments, NC comes to the rescue again and brings to light DA’s dastardly chicanery.