The most common and most likely answer to this crossword clue is the 12 letter word EPIDEMIOLOGY
I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Science" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case science = epidemiology.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 EPIDEMIOLOGY mean?
EPIDEMIOLOGY noun- The branch of science dealing with the spread and control of diseases, viruses, concepts etc. throughout populations or systems.
- The epidemiological body of knowledge about a particular thing.