Cryptic crossword clue
Drug that should be deeper in somehow hard to inject 9

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

I've seen this crossword clue in The Daily Telegraph
E
P
H
E
D
R
I
N
E

Buddy explains!

The straight part
We know that "Drug" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drug = ephedrine.
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 EPHEDRINE mean?

EPHEDRINE noun
  1. An alkaloid, found in some species of Ephedra shrubs (or prepared synthetically).
  2. A medication whose active ingredient is ephedrine, used as a sympathomimetic drug.

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