While Circle of Power is a fantastic spell that normally this would be a top pick for a 10th level Magical Secrets, it's important to remember that the OP's party includes a Twilight Cleric who already has access to this, so it's less of a slam dunk here...
Twilight Clerics are the only ones that are able to access Circle of Power as low as Level 9, and only one of two (the other being Level 10+ Bards with Magical Secrets) who can access it before Level 17 Paladins.
It's reason number Eleventy-Seven why Twilight Clerics are super strong.