The most common and most likely answer to this crossword clue is the 7 letter word VEERING
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The straight part
We know that "Shifting" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shifting = veering.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does VEERING mean?
VEERING verb- To let out (a sail-line), to allow (a sheet) to run out.
- To change direction or course suddenly; to swerve.
- (of the wind) To shift in a clockwise direction (if in the Northern Hemisphere, or in a counterclockwise direction if in the Southern Hemisphere).
- (of the wind) To shift aft.
- To change direction into the wind; to wear ship.
- To turn.
- A motion that veers; a sudden swerve.