Speak pompously about teapot feature (5)
I believe the answer is:
spout
'speak' is the definition.
(spouting is a kind of speaking)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for spout that I've seen before include "Declaim; throw out in a spout" , "Talk at length; part of kettle" , "Talk (rubbish); part of pot" , "Mouth of a kettle" , "Pouts beneath jet of liquid" .)