Can You Solve This Crossword Clue?

There was a very good chess-related clue in today's (17 Feb) Guardian crossword...

"Chess player heard to do what Humpty Dumpty did to friend - some egg!" (7 letters)

I managed to get it but only after working out the 3rd and 7th letters from other clues. Can you work it out? I'll give you a clue in 'comments'...