Times Jumbo Cryptic 754

[Palgrave]

1A Puzzle involving big horse and a shrub (8) ??S???S?
52A God is set against god in river (11) ??A?M?P?T?A
54A The rest have to follow song (3-4) ??E ?O?N

[JoolsTwo]

52a Brahmaputra ?

[JoolsTwo]

54a Lie Down

[Palgrave]

Thank you. One more query. 25A Excellent bovine (4) is presumably NEAT, but why?

[junction]

Hi,
NEAT is an ox,cow bull etc

[Palgrave]

Thank you

[spitza]

for 1a i have rosebush

[Gissing]

Thanks