Last two:
12A Christopher finds it hard to make friends (4) ??T?
1D They gape when catching king in the altogether (8) T?A???R?
The first letter of 12A is also the fifth letter of 1D. It's possible the first letter of 1D is wrong as I have THRIFT for:
1A Spend little on fabric that's soft (6) ??R?F?