3A Sort of chap to avoid in winter? (9)
24A Put down on ourstanding achievement (6) (RE?O??)
4D Put on edge (4) (??NE)
5D Ornithological frolics (5) (??E?S)
6D Gaol sounds hair-raising (4-2) (??T?UP)
7D I take round a thank-you letter (4) (??I?)
13D One kept - in suspense (9) (?E?E???N?)