For anyone without the crossword - you can get the pdf version here
http://www.theguardian.com/crosswords/2014/dec/20/prize-crossword-no-26448 - each clue consists of 2 parts with the first of those going in the left grid and the 2nd part going in the right grid; but an extra letter has to be added to one of each pair of solutions before entry into the grid.
8a: US sports player, one from HQ, linked with forward daughter under the sheets (7;7)
10a: Queen's make-up showing a pinch of colour - a bit of white included (6;6)
the letter counts are for the solution for left/right grid