Jacqueline Susann novel, and the problem with some of the answers in this puzzle

Question:

Answer:

ONCEISNOTENOUGH

Length:

Similar Crossword Questions:

Place to live (different ones are hidden in this puzzle's four longest answers)
Many thoroughfares ... or what this puzzle's Across answers consist of?
Feature of six other long answers in this puzzle
Former state "separated" in seven puzzle answers: Abbr.
1967 war film, and an apt description for this puzzle's starred answers
Peak that's hidden in the four longest puzzle answers
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Element of surprise in this puzzle's theme answers
Piece that can follow the ends of the nine longest puzzle answers
Write in any of this puzzle's eight theme answers?
Business term found in eight long puzzle answers
One of the four that end this puzzle's starred answers
Picnic serving, and when divided properly, a hint to a hidden feature of six pairs of puzzle answers
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Informal chat, and based on the starts of the starred answers, this puzzle's title
Queen whose name contains three apt words in a row, as does each of this puzzle's four longest answers
European acme, and word hiding in this puzzle's 5 longest answers
What each completed pair of theme answers in this puzzle is
Equipment for each of this puzzle's theme answers
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Office building problem that's a hint to this puzzle's theme entries (see their last three letters)
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Environmental slogan, or a hint to this puzzle's theme answers
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Easy, and what this puzzle's theme answers literally are