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Am now stuck and need a hand please:
15a Non-flyer hiding head? It enables high-flyers to spread their wings (7) ?R???U?
1a Ground-ice, brittle when it's about zero (6) F?????
4d Lured mariners will be seen to have erred in tangling with such sirens (6) ?AR??S

15a Erasmus. RAS inside EMUS. (the clue is "Non-flyers...). Erasmus is the acronym for an EU scheme to sponsor students studying overseas.
1a Frazil. Z in FRAIL
4d Larums. Anag of "lured mariners" less "erred in".

15 non flyers are emus
4 complex anag > luredmariners-erred in
1A Z(ero) in word for frail

Thank you peterm & ixion