Pure Fun! (Themed #12)

This is a themed puzzle that was rejected by a couple of outlets for similar reasons. On the one hand, they said the theme felt too familiar; on the other, they felt the second ‘layer’ of theme would be a bit too obscure for many solvers.

I’ve always liked it, and now that I have my own site, I’m putting it out there.

As always, comments are welcome.

[For those uncertain of the second ‘layer’ of the theme, there’s a link to an explanation under the puzzle].

Made by Jeanne D. Breen with the free crossword builder from Amuse Labs