Cryptic crossword clue
Agent at unit being treated is getting weaker 11

The most common and most likely answer to this crossword clue is the 11 letter word ATTENUATING

I've seen this crossword clue in The Daily Telegraph
A
T
T
E
N
U
A
T
I
N
G

Buddy explains!

The straight part
We know that "getting weaker" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case getting weaker = attenuating.
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 ATTENUATING mean?

ATTENUATING verb
  1. To reduce in size, force, value, amount, or degree.
  2. To make thinner, as by physically reshaping, starving, or decaying.
  3. To become thin or fine; to grow less.
  4. To weaken.
  5. To rarefy.
  6. To reduce the virulence of a bacterium or virus.
  7. To reduce the amplitude of an electrical, radio, or optical signal.
  8. (of a beer) To become less dense as a result of the conversion of sugar to alcohol.

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