Guardian Prize Crossword 27764 Saturday March 9Th 2019

[Spanishfly]

I think 1ac might be BEST MAN, but can't see why:
He probably knows a South American footballer, missing centre-back, white clothes (4,3) ??S? M?N

As for 1d(13), I have STEPMOTHER for the second half, but can only thin of Cinders, which doesn't fit:
Musical put on stage to nurture traditional character (6,10)
??C?E? STEPMOTHER

[Toorak]

Wise man
Wicked stepmother

[scorpiojo]

Wicked (musical) s teP mother

[Lie-in King]

1a Wise man - 'wan' (white, clothes; contains) 'Me(s)si' (missing centre, back)
1,13d Wicked stepmother - 'Wicked (musical) step (stage) mother (nurture)'

[Spanishfly]

Thanks, I see I was being obtuse :)