Notifying is significant (7)
I believe the answer is:
telling
I believe this is a double definition.
'notifying' is the first definition.
(synonyms)
'significant' is the second definition.
(I've seen this before)
'is' is the link.
(Other definitions for telling that I've seen before include "briefing" , "Revealing, significant" , "relation" , "Giving an order" , "influential" .)