Proximity of a disc jockey, expert contacted originally in New York (9)

'proximity' is the definition.
(thesaurus)

'a disc jockey expert contacted originally in new york' is the wordplay.
'disc jockey' becomes 'dj' (synonyms).
'expert' becomes 'ace' (ace can informally mean very good).
'originally' indicates taking the first letters.
'in' indicates putting letters inside.
'new york' becomes 'ny'.
The first letter of 'contacted' is 'c'.
'c' going into 'ny' is 'ncy'.
'a'+'dj'+'ace'+'ncy'='ADJACENCY'

'of' is the link.