Cryptic crossword clue
One simple herb, a riotous perennial 12

The most common and most likely answer to this crossword clue is the 12 letter word IMPERISHABLE

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

The straight part
We know that "peren/nia/l" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case peren/nia/l = imperishable.
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 IMPERISHABLE mean?

IMPERISHABLE noun
  1. (in the plural) something that does not perish, or keeps for a long time
IMPERISHABLE adjective
  1. Not perishable; not subject to decay; enduring permanently

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