Hi, Rusty!
Yes, for 4d, I have "exec" = "manager"(def)
I thought "ex" - "old"
but am stuck on the EC?
EC is a London city post code...but I cannot see that this is any help?
You could well be correct with your fathoming of "EC", ONCE meaning
"European Community"
I certainly cannot see any other plausible explanation.
Well done!
For 25a, I have "duo" = "pair"(def)
but can go no further...
Do you think "report" may indicate a homophone?