10a American fellow about to pose (7 letters)
??a???n
3d Castle key cut with a toothed tool (4 letters)
R??? (could it be rook?)
23d Stuff about soldiers (admiral included) 4 letters
???M
I normally like cryptic crosswords but I find the clues in this one every week leave me rather, if you'll pardon the pun, clueless! Any help appreciated.