Cryptic crossword clue
Sort of flu vaccine adversary kept in shelter 9

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

T
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Buddy explains!

The straight part
We know that "Sort of flu vaccine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sort of flu vaccine = trivalent.
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 TRIVALENT mean?

TRIVALENT noun
  1. Any trivalent chromosome
TRIVALENT adjective
  1. Having a valence of three.
  2. (of a vaccine) Protecting against three different (usually flu) viruses.

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