12a In meteorology, a turbulet eddy typically circulating about a horizontal axis in the lee of a mountain (5) R?T?R
35a English zoologist and poneering animal ecologist noted for his research and studies of food chains and vermin control.....PHEW (5) E?T?N
4d Silicae mineral such as muscovite and lepidolite, used as an electrical insulator (4) N?C?
5d Musical notation indicating a piece must be played sweetly and gently (5) D?L?E