Geometry product AREA [product = length X width]
Zapped in the microwave NUKED [There's good slang and bad slang; this is good.]
Dog's dogs PAWS [never understood how feet became dogs]
Sentence ender for PERIOD might be changed to
"And that's it!" 
Odd that both TENT and TEPEE are clued immediately adjacent to each other.
I realize my age when I see entries like
Thunder on a radio show, which I recall as a SOUND EFFECT, and
Fit to be tied, which I haven't heard in 50 years.
