Many thanks,still stuck on a few though !
24a. Father's Dynamo. 9 letters. ??n?r?t?r
3D. Henry in river to emit vapour. E?h?l?
7d. First mentioned topless shelf. O?m?r
16d. Heard arbiter intended to form opinion. ?u???e?d
Thanks to all,finished now. I think 7d must be " former"....first mentioned and f missing,hence topless. Very grateful to all you bright crossword lovers.