Cryptic crossword clue
One often changing position, thanks to Ahab finally with killer whale returning 7

The most common and most likely answer to this crossword clue is the 7 letter word ACROBAT

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Buddy explains!

The straight part
We know that "One often changing position" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one often changing position = acrobat.
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 ACROBAT mean?

ACROBAT noun
  1. An athlete who performs acts requiring skill, agility and coordination.

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