- "Slang, for many" = ZILLIONS - the answer's not a word used as slang by many people, it's a slang word meaning 'many'. "Slang for many"!
- "I, for one" = ROMANNUMERAL, not "Pronoun" or "Iodine".
- "Scientific definition, for short" = ELECTRICALFAULT, not, I dunno, say, "Avogadro No."
- "Length, for example" = SEVENLETTERS, not "Dimension".
- "Anagram, for instance" = ANCIENTS, not "Wordplay". This is the one that I twigged on.
I love this! As a cryptic crossword solver, it really rubbed me the right way.
Even aside from the theme, which I got most of the way through before sussing out, this was a very fun solve. I entered "Lab" instead of GYM as a science fair location, and "Hub" not WEB for "Nexus", which set me back somewhat (Oh, and "Galas" not FLAPS for "Big to-dos".). The SW corner just about broke me - eventually guessed EAPOE for 50 down, as hinted by the clue, and finally deduced DOUGIE as the Guy who inspired a hip-hop dance. Is it Dougie Guy? Or Guy Dougie? Or just some guy named Dougie? I suppose the Internet can tell me, if I make an ever-so-slight effort. All told, it took me 9:05, and I felt like it was time well spent.
"Low turnover?" (SOMERSAULT) was clever, as was "Mini display?" (KNEE).
I'd like to dwell on this puzzle some more, but I have to dash, as I have to pay a visit to the hospital at 3:30 am (yes, you read that right). No, it's not the ICU, not THELOVEBUG nor any other kind of bug, and I'm not being ADMITTED - it's a scheduled MRI to AID the MDs in STUDYing something weird going on with my jaw. This MIFFs me and I am GLOOMIER and less UPBEAT than I'd normally be. So, off with me for a couple hours of sleep. See you on the other side!