Older and nosier unfortunately (6)
I believe the answer is:
senior
'older' is the definition.
('senior' can be a synonym of 'older')
'nosier unfortunately' is the wordplay.
'unfortunately' indicates an anagram.
'nosier' is an anagram of 'SENIOR'.
'and' is the link.
(Other definitions for senior that I've seen before include "'Older, superior (6)'" , "Older in years or higher in rank" , "Pupil in a higher form" , "Higher in status" , "Older or higher in standing" .)