Knock back tea loudly -- drink quickly holding pot (4,4)
I believe the answer is:
turn down
'knock back' is the definition.
(I know that knock back can be written as turn down)
'tea loudly drink quickly holding pot' is the wordplay.
I cannot really understand how this works, but
'tea' could be 't' (I've seen this in other clues) and 't' is present in the answer.
'drink' could be 'down' (to down something can mean to drink it quickly) and 'down' is found in the answer.
'pot' could be 'urn' (urn is a kind of pot) and 'urn' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for turn down that I've seen before include "prepare bed" , "Reject - reduce volume" , "Dim - reject" , "Refuse - to reduce the volume" , "Spurn" .)