“Grps. that are often inactive in the summer”

Real estate, e.g.

First word of Carroll's "Jabberwocky"

Frida who portrayed her chronic pain through art

Water wheel?

The best of the best

Acrobat developer

"You're in on this?"

Tattle on ... or an instruction for answering 22-Across

Proverbial bad thing to have your mind in