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Hello ulysses100
The answer to 30a is not fenced, and the correct answer is critical. So a couple of hints for that, the word "over" in the clue is an instruction on how to enter the alternative word for "stooped" after it has been modified in accordance with the 2 words prior to "stooped".The 4th letter of the correct answer to 30 is important, to the character in the lead.
The whole of the "representation" is in a straight line, and each participant is either side of the 5 letter barrier. How many ways can that happen? I had to revert to Chambers to confirm the leading character. Symmetry for both the barrier and characters is important, see the last post from novalis.
The 7 letter thematic item lurking at the end of the barrier is singular, and for a hint see my hint to copelander. It is not in a straight line, and the central letter of 17a is also critical. I went astray here, I was mislead by misinterpreting "young adolescent" in Chambers for what I originally used as part of the answer, Chambers actually uses "young hooligan" for what should be used in the entry.
Hope this helps.