It is said there is nothing to share (7)
I believe the answer is:
oration
'it is said there' is the definition.
The definition suggests a singular noun which matches the answer.
'nothing to share' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'to share' becomes 'ration' (a ration is a share of a limited resource).
'o'+'ration'='ORATION'
'is' is the link.
Can you help me to learn more?
(Other definitions for oration that I've seen before include "A long ceremonial speech" , "An eloquent speech" , "words" , "eulogy" , "Major speech" .)