Cryptic crossword clue
Semi-clean suspect offered hallucinogen 9

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

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

The straight part
We know that "hallucinogen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case hallucinogen = mescaline.
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 MESCALINE mean?

MESCALINE noun
  1. A hallucinogenic and intoxicating compound present in the peyote cactus (Lophophora williamsii), the San Pedro cactus (Echinopsis pachanoi), and the Peruvian torch (Echinopsis peruviana).

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