Having no news? It's not impressive (7,2,5,4,5)
I believe the answer is:
nothing to write home about
'having no news?' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'it's not impressive' is the wordplay.
I cannot quite understand how this works, but
'not' could be 'no' (negative) and 'no' is located in the answer.
'it' could be 'thing' and 'thing' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for nothing to write home about that I've seen before include "It's of no special interest" , "reason for not sending holiday postcard?" , "Plain" , "Not very attractive (colloq.) (7,2,5,4,5)" , "Unremarkable" .)