Down the pub, you'd want to grab the whole thing as one lump, shake it about, and see what falls out. "Ground" is telling you to grind up the letters of "doesn't vex a" — chuck that lot into the anagram machine and it rearranges neatly into DAVE SEXTON. And the reason it fits is the definition at the end, Manchester United manager, pointing straight at the man himself, Dave Sexton.