The most common and most likely answer to this crossword clue is the 12 letter word MULTIPLICITY
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Buddy explains!
The straight part
We know that "Host" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case host = multiplicity.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 MULTIPLICITY mean?
MULTIPLICITY noun- The state of being made of multiple diverse elements.
- The number of values for which a given condition holds.
- A large indeterminate number.
- (UML) The number of instances that can occur on a given end of a relationship, including 0..1, 1, 0..* or *, and 1..*.