I wanted to use a contraction for...what Fletcher's after.... but that looks wrong. “Do you understand what Fletcher is after?"
Apostrophe, not opostrophe btw. So here, you're using 's as a contraction for is. You can do it, and it's fine, but "Fletcher is" may work better in writing unless it's part of spoken dialog.
Woops. And the one time I didn't run it throught spellcheck. Yeah, it's in dialog but I think I will just say.... Fletcher is..