Cryptic crossword clue
Antiviral agent physician’s injected iron men sent back 10

The most common and most likely answer to this crossword clue is the 10 letter word INTERFERON

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Buddy explains!

The straight part
We know that "Antiviral agent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case antiviral agent = interferon.
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 INTERFERON mean?

INTERFERON noun
  1. Any of a group of glycoproteins, produced by the immune system, that prevent viral replication in infected cells.

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