Nobody of note, tiny person ultimately? Possibly (9)
I believe the answer is:
nonentity
'nobody' is the definition.
('nonentity' can be a synonym of 'nobody')
'note tiny person ultimately? possibly' is the wordplay.
'ultimately?' suggests the final letters (I've seen 'ultimately' mean this).
'possibly' indicates anagramming the letters.
The last letter of 'person' is 'n'.
'note'+'tiny'+'n'='notetinyn'
'notetinyn' with letters rearranged gives 'NONENTITY'.
'of' acts as a link.
(Other definitions for nonentity that I've seen before include "Person of no importance" , "Insignificant person" , "not even second fiddle produced" , "A nobody" , "Unimportant person" .)