The phrase revealed by reading the circled letters from top to bottom is a hint to the themed entries, vis a vis the info clued in the two parts of each parenthetical.
This one's a tad clunky (hey, it's only my second one! go easy on me!). It was an idea I got excited about and wanted to see through, and it ended up being a good exercise in stacking longer entries; ultimately a good challenge in a few ways. I hope folks are able to enjoy!