The most common and most likely answer to this crossword clue is the 7 letter word PHYSICS
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More clues leading to the result PHYSICS
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 = physics.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 PHYSICS mean?
PHYSICS noun- A medicine or drug, especially a cathartic or purgative.
- The art or profession of healing disease; medicine.
- Natural philosophy; physics.
- A physician.
- To cure or heal.
- To administer medicine to, especially a purgative.
- The branch of science concerned with the study of the properties and interactions of space, time, matter and energy.
- The physical aspects of a phenomenon or a system, especially those studied scientifically.