3d. Scotsman is returning to Egyption peninsula. (5) s - n - i
15d. (7)Second priest organised bands
s - r - - - s
16a. (4) Voracious beast to run smoothly up - o - f
21a. (4) Bound along incline, but not initially l - - -
The third letter of 21a. is the 5th letter of 15d.
All help appreciated