The preamble should have used 'somewhere' instead of 'someone'. 16 is not in the 2008 edition either and possibly there should have been reference to 14 being half acronym.
I have a complete grid, including 27ac, except for one letter - the last letter of 46. There are only a limited number of words which fit and none of them seem to have any connection with the clue. The clue looks like a thematic one, but I already have the 10. Can anyone help?