Wineglass feature (4)
I believe the answer is:
stem
'wineglass feature' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for stem that I've seen before include "Restrain the flow of" , "Main part of noun or verb" , "supporter of flag, for example" , "Main upright of a ship's bow" , "Block" .)