Had a break from this one, as I'm finding it quite difficult this morning ... just come back to it and none the wiser, so would appreciate some help, please ...
5d second highest mountain is extremely hard (8) s?????s?
4d avoid legal action when held up in station (6) e?s???
12a crude quality of lessons reported to head (10) ?????e?e??
8d semi precious stone mounted for high-fliers (3) ??? ??t