Mon Daily Mail No. 14,837
23d) Cavalryman's foolhardy, riding up so seize American (6) no letters
25a) Solve vital clue about book that's fine for 28 (10) ???T?V???E
26d) Message some sent externally (4) no letters
27a) Head of sport's ignored children's complaint (7) R?C????
29a) New tutor's page contains notice about PHD student, say (12)
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Many thanks in advance for your help.