21a Poet's order to horse that's unenforceable (10) ??I?K?A???
5d Second highest mountain is extremely hard (8) - I've got something wrong here, as the letters don't seem to fit anything I can think of and are probably causing me to miss the obvious - so any help appreciated. Thank you
Thank you Lie-in King, especially for the explanations. Maybe one day I'll get them without help, but at the moment I'm very grateful when people take the trouble to explain!