Theme answers' commonality - Answers with 13 Letters

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Commonality of the theme answers
Time to feature any of the three theme answers?
Brief time (found in all four theme answers)
Bit of footwear that appears at both ends of this puzzle's theme answers
WORD OF CHEER HIDDEN IN THEME ANSWERS
What the self-contradictory words found in this puzzle's theme answers are examples of
"Gosh!" (or, based on the starts of starred answers, one who is expert at solving this puzzle's theme?)
What the theme answers have in common
The pairs of letters inserted into each of this puzzle's theme answers, for example
Feature of this puzzle's theme answers?
When spelled out, word that follows the beginnings of the starred answers in a memorable kids' show theme song
Supplements added to each of this puzzle's theme answers
Term for each of the 15 asterisked theme answers in this puzzle
Numerator for this puzzle's theme answers
Big letters, for short (and what your answers must be written in to understand the theme)
Shoe additions, and what this puzzle's theme answers contain
New element in each of this puzzle's theme answers
What the puzzlemaker did to the name in each of this puzzle's theme answers?
Rumored reason for the stock market plunge of 5/6/10, whose effect is seen in this puzzle's theme answers
This puzzle's theme found in the answers to five asterisked clues
1997 Kevin Kline film, and a hint to the puzzle theme hidden in four answers
Letters for the names "buried" in this puzzle's theme answers
Number inaugurated into this puzzle's theme answers
One way to describe the theme answers?
Announcement/event of September 2011, or what happened to the theme answers