Finds an absorbing use for straw (5)
I believe the answer is:
sucks
'finds' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Maybe you can see a link between them that I don't see?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for sucks that I've seen before include "Makes a partial vacuum with the mouth" , "Uses a straw" , "Draws into the mouth, liquid or air" .)