Decant (4)
I believe the answer is:
'decant' is the definition.
(I know that decant is a more specific form of pour)
This is all the clue.
(Other definitions for pour that I've seen before include "Pelt - decant" , "Cause to flow in a stream" , "Cause to flow as from pot to cup" , "(Of rain) fall heavily" , "Dispense (e.g. tea)" .)