Cryptic crossword clue
Administers toxin to revolutionary spy island captured 7

The most common and most likely answer to this crossword clue is the 7 letter word POISONS

I've seen this crossword clue in Financial Times
P
O
I
S
O
N
S

Buddy explains!

The straight part
We know that "Administers toxin" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case administers toxin = poisons.
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 POISONS mean?

POISONS noun
  1. A substance that is harmful or lethal to a living organism.
  2. Something that harms a person or thing.
  3. A drink; liquor.
  4. Any substance that inhibits catalytic activity.
POISONS verb
  1. To use poison to kill or paralyse (somebody).
  2. To pollute; to cause to become poisonous.
  3. To cause to become much worse.
  4. To cause (someone) to hate or to have unfair negative opinions.
  5. To inhibit the catalytic activity of.
  6. To place false information into (a cache) as part of an exploit.

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