16a= Opening really regularly foundin the front of the body (7) *V*N*R*L.
34A= Prophet, surgeon and composer (6,6)*A*U*L,*A*U*R.
54A = Stop Italian port taking an outlandish foreigner, (9) O*R*G*I*A.
50D = Back of jacket has passing mention for good book (5) T*B*T.