Cryptic crossword clue
Eternal taboo broken by the first of seven angry neurologists 9

The most common and most likely answer to this crossword clue is the 9 letter word INCESSANT

I
N
C
E
S
S
A
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T


Buddy explains!

The straight part
We know that "Eternal" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case eternal = incessant.
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 INCESSANT mean?

INCESSANT adjective
  1. Without pause or stop; not ending, especially to the point of annoyance.

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