Beer gets nothing from plant (4)
I believe the answer is:
aloe
'plant' is the definition.
The answer is an example.
'beer gets nothing' is the wordplay.
'beer' becomes 'ale' (type of beer).
'gets' means one lot of letters goes inside another (gets can mean captures or absorbs).
'nothing' becomes 'O' (O resembles 0).
'ale' going around 'o' is 'ALOE'.
'from' is the link.
(Other definitions for aloe that I've seen before include "Fleshy-leaved plant" , "has a bitter taste" , "Plant source of purgative drug" , "O, ale with bitter plant" , "Succulent plant (may be bitter!)" .)