Teapot opening (5)
I believe the answer is:
spout
'teapot opening' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for spout that I've seen before include "Declaim; throw out in a spout" , "Gush" , "Hold forth at length" , "Talk (rubbish); part of pot" , "Make speech; part of teapot" .)