The most common and most likely answer to this crossword clue is the 6 letter word FLUIDS
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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 FLUIDS mean?
FLUIDS noun- Any substance which can flow with relative ease, tends to assume the shape of its container, and obeys Bernoulli's principle; a liquid, gas or plasma.
- A liquid (as opposed to a solid or gas).
- (specifically, typically in the plural) Intravenous fluids.