44d - Blues band reaches a high point perhaps C??m?I - well I think it is "I" otherwise I have the showbank=d wrong, and obvioulsy climax would fit 38d - play by WB YEats P?r??t??y 6d - scifi trilogy by CS Lewis - R?n??M 3d Finish off secluded new celtic monks? c???e?S
CULDEES is the correct answer to 3D. It is an anagram of "secluded" in the question, minus the last "d" which you were asked to "finish off" for you to get "seclude" from which you finally get "CULDEES". Simple, isn't it ?