Open, as a wine bottle (6)
I believe the answer is:
uncork
'open as a wine bottle' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for uncork that I've seen before include "Open (Chablis, say)" , "Remove traditional stopper from wine bottle" , "open tent?" , "Clear a bottleneck" , "Release the stopper" .)