5a Send up - 'sp(ecial)' (clothing; round) 'end u(ni)'
21d Friend - 'fiend' (snatching) 'r(ose)' (tip)
22a Diaeresis (umlaut, as in Brontë) - 'sis(ter) ere (before) aid (back)' (from east; back)
28a Dorado - 'R(oyal) A(cademician)' (in) 'do + do' (party x2)