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Hi . Last few clues. Any help will be gratefully accepted .
30 ac Unsophisticated in joke about head of school.8
-o-e---n
31d Choose a mystic symbol say identifying rogue 8.
--c-r-o-e-
37d Serving to introduce movable indicator in quarry 1 10 letters
p-e-u-s---

37 pre cursor y

homespun

picaroon

30a home s pun

Many thanks to you all .I was racking my limited brainpower to get answers and they are so obvious .!!