18a Herod's legacy depicted in film with a couple of lines (7,4) m-s-e-n -a-l.
23a Trainspotter ultimately missing mass transport system with old-school charm (5) r---o
19d Mist up oriel, a little haze (6) ---p-r.
Yes, to 23 and 19. RETRO is R + (m)etro. I can see the parsing of Western Wall, but also have M as first letter of solution. Had IMPISHLY for the crosser. So must be OWLISHLY- parliament of owls, presumably.