Reporter's announcement produces marked effect (7)
I believe the answer is:
impress
This clue might be a double definition.
'reporter's announcement' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'marked effect' is the second definition.
The definition and answer can be both to do with creating things as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'produces' is the link.
Can you help me to learn more?
(Other definitions for impress that I've seen before include "Inspire admiration in (someone)" , "Use stamp; earn respect from (someone)" , "Mark of a stamp/seal" , "Simpers (anag.)" , "Earn good opinion of, or stamp" .)