State benefit is about right (6)
I believe the answer is:
assert
'state' is the definition.
(I've seen this before)
'benefit is about right' is the wordplay.
'benefit' becomes 'essa' (I can't justify this - if you can you should believe this answer much more).
'is about' says the letters should be written in reverse.
'right' becomes 'rt'.
'essa' backwards is 'asse'.
'asse'+'rt'='ASSERT'
Can you help me to learn more?
(Other definitions for assert that I've seen before include "Confidently say" , "State firmly or vigorously" , "Forcefully state" , "Aver, maintain" , "State clearly" .)