1A Box containing one black key, large one (5,3)
15A Making festive soup that's not filling? Apparently, fish to eat (11)
41A Effective delivery not yet confirmed with baby to collect (3,4)
45A Sybarite returned to unemployment in another time (5-5)
54A Almost endless energy left when cutting a decoration (7)
If someone can please help me with these, I'll try to do my missing 'down' clues on my own!
Stop, Neveracrossword! Mamyalynne has given me 54A. Age long. Thanks, Mamyalynne. I don't know how you do it. Thanks to both. I'll try my Down clues now! :-)