Some help for the following will be appreciated, please:
ACROSS
11 Top flier backs helper fro sloth( 6 ): ????I?
15 The head that's characteristic of the Russian church ( 5): ?NI??
17 lay claim to 32s somehow ( 6 ): ??SE??
21 Caught fish, mushy peas and wine? ( 7 ): ????R??
26 Prince, lively, talking idly ( 9 ): ????T????
Thanks in advance!