Possible Clues:

• In a manner of speaking, it's one of the first signs of spring in reference books
• In a manner of a speaking, part of the horoscope in publications that are wordy perhaps in the extreme
• In a manner of speaking, raise doubts these are wordy reference books
• Sign on delivery for reference books
• In a manner of a speaking, part of the horoscope in publications, wordy perhaps, in the extreme
• Phrasing sign of spring in reference books
• Volumes of meaning in speech before House
• Style of speech stars found in books
• A direction is given about books crossword setters may use
• Some stars support speech, the result of 7