Stuck with last corner. Need a start
12a university meeting 7 ltrs
?e???a? (Seminar) ?
23a Tell tales 5 ltrs
?n???
13d embed surgically 7 ltrs
??p????
34a tough- disciplined 6 ltrs
???i??
17d ruler in place of a monarch 6 ltrs
?l?e??
14da nipped in the bud8ltrs
???t?i?d
think there must be a few letters wrong somewhere,