Ninety not out but a man of little consequence (9)
I believe the answer is:
nonentity
'a man of little consequence' is the definition.
I can't tell whether this definition defines the answer.
'ninety not out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'ninety'+'not'='ninetynot'
'ninetynot' with letters rearranged gives 'NONENTITY'.
'but' is the link.
Can you help me to learn more?
(Other definitions for nonentity that I've seen before include "No leading player" , "Insignificant person" , "A nobody" , "Person of no importance" , "cipher" .)