Hear about right offering little reward (5)
I believe the answer is:
learn
'hear' is the definition.
(I know that hear can be written as learn)
'about right offering little reward' is the wordplay.
'about' means one lot of letters goes inside another.
'right' becomes 'r' (common abbreviation).
'offering little reward' becomes 'lean' (lean can mean giving little nourishment or reward).
'r' put inside 'lean' is 'LEARN'.
(Other definitions for learn that I've seen before include "Study (at school?)" , "be taught a lesson" , "Study - find out" , "Con" , "Acquire 28 across" .)