The most common and most likely answer to this crossword clue is the 8 letter word REDSHIFT
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The cryptic/wordplay part
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What does REDSHIFT mean?
REDSHIFT noun- A change in the wavelength of light, in which the wavelength is longer than when it was emitted at the source.
- (US politics) The statistical bias towards Republican (or Blue Dog) candidates of US federal elections whose reported results vary considerably from those indicated by voter exit polls.