This has been a real struggle and I'm left with these:-
29 Across - "Old African film - and welcome theatre performance" (6)
-T-I-P
31 Across - "Recruits ultimately neglectful in returning without shirts" (9)
E-L-S-E-S (ENLISTERS, I imagine)
41 Down - "Get involved in a day to celebrate trainee nurses" (9)
I-T-R-E-E (INTERFERE or INTERVENE?)