4d. Connecting stake with very small fence centrally (7)
b.t.e.n. Battern?
14d. Group of nasty people, work at keyboards (4)
.y.e
Can't parse 15d, What shortbread might do in autumn all by itself (4,5).
With crossing letters I think it must be Fall Apart, but why? Fall = autumn, a part = all by itself, but does shortbread have a tendency to fall apart?