Cryptic crossword clue
Ring the changes – make pub egg-shaped 8

The most common and most likely answer to this crossword clue is the 8 letter word INNOVATE

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Ring the changes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ring the changes = innovate.
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 INNOVATE mean?

INNOVATE verb
  1. To alter, to change into something new; to revolutionize.
  2. To introduce something new to a particular environment; to do something new.
  3. To introduce (something) as new.

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