Cryptic crossword clue
Doughnut-shaped gold ring in sort of wave 8

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

I've seen this crossword clue in The Times
T
O
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Buddy explains!

The straight part
We know that "Doughnut-shaped" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case doughnut-shaped = toroidal.
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 TOROIDAL mean?

TOROIDAL adjective
  1. Having the shape of a torus or toroid

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