Solution: Know-it-all, in Britspeak - NYT Crossword

I appreciated the explanatory (if ribald) clause in Mr. Walden’s notes below and figured that the subject in question in CLEVER DICK was a person (and the Oxford dictionary ostentatiously uses a she in its contextual example). I don’t remember hearing this expression and doubt that I’d use it myself, but it does remind me of an old favorite, “Clever Hans,” the horse from 100 years ago that could “count.” If you know about Hans, then you know why your dog is already in the kitchen even though you only just thought about fixing a snack for yourself during the next commercial.