19a Material produced by nutty artists (6) -A---S.
25a Herein's Schumann's Third, not Beethoven's Third which would be wrong 97) R-E----.
20d Get education about religious matters going to church? I have ! (7) --C---E.
25 Across, I think the answer is RHENISH(The name of Schumann's Third Symphoy), But that has mucked up my 23 Down ,Go deficient?Not right!(4)
?H?T, I did have LEFT.
Hope this helps.