Hears about allocation (5)
I believe the answer is:
share
'allocation' is the definition.
(I know that share is a type of allocation)
'hears about' is the wordplay.
'about' indicates an anagram.
'hears' with letters rearranged gives 'SHARE'.
(Other definitions for share that I've seen before include "Part, portion" , "Division" , "Portion; plough blade" , "Divide out, apportion" , "Cutting blade" .)