Talk of nothing to share (7)
I believe the answer is:
oration
'talk' is the definition.
(thesaurus)
'nothing to share' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'to share' becomes 'ration' (ration is a kind of share).
'o'+'ration'='ORATION'
'of' is the link.
(Other definitions for oration that I've seen before include "A formal or public speech" , "A public or ceremonial speech" , "Ontario (anag)" , "words" , "Making a speech" .)