Take down, or push up, a certain quantity (3)
I believe the answer is:
sup
'take' is the definition.
(I know that sup is a type of take)
'down or push up a certain quantity' is the wordplay.
I cannot quite see how this works, but
'up' is found in the answer.
'quantity' could be 's' (S is an example) and 's' is found within the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for sup that I've seen before include "Eat a late meal; sip" , "Drink; eat evening meal" , "Drink; take a late meal" , "A mouthful of liquid" , "Imbibe" .)