Sealionsteve,
10d - it's a humorous cryptic type clue, as in if one works hard one might get a (blue) "plaque" by way of recognition, but if you're a 10d you'll also come across some plaque.
At least that's how I read it.
Re 6d, I think Mattrom and I are basically saying the same thing, hence my mention of children and her mention of birth.