Psychological problem that could make us nosier (8)
I believe the answer is:
neurosis
'psychological problem' is the definition.
(neurotic problem)
'could make us nosier' is the wordplay.
'could make' is an anagram indicator.
'us'+'nosier'='usnosier'
'usnosier' anagrammed gives 'NEUROSIS'.
'that' acts as a link.
(Other definitions for neurosis that I've seen before include "Mild mental problem" , "Mild condition such as obsessive behaviour" , "So insure against the nervous disorder" , "Resinous (anag) -- unspecific personality disturbance" , "Mild mental illness not caused by an organic disease" .)