G...(autocorrect made it Gandalf and I can't remember, sorry!), I think "such" is more significant than it seems: ambassador=he = "heart" with such, where "such" is the 11-letter solution - ie the removal, or lack, of "art".
I was previously trying to parse it by adding "he" to the 11-letter word and using that 13-letter word, but I don't think that's the way.
Does that help?