A receptive or acquisitive thing to do (3)
I believe the answer is:
get
'do' is the definition.
(I know that get is a kind of effect)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for get that I've seen before include "Escape" , "Fetch or obtain" , "Receive; obtain" , "Procure from vegetables" , "See 18" .)