First time posting to the forum. Would greatly appreciate a nudge towards understanding 10d. I have everything else complete in the crossword - the theme, the instruction from the extra letters, the unclued entries and the shading. All I am left with is the unchecked letter in 10d, which I think has only one possibility if the grid entry is to be a real word (and taking account of what I think the answer in the crossing unclued entry is and why). In the clue, I have an idea what 70 might represent, but I can't see any detectives or smackers suggested by the letters I have. Any help with this parsing gratefully received!