Cryptic crossword clue
Lab test watery spot that I’ll introduce into another 8

The most common and most likely answer to this crossword clue is the 8 letter word BIOASSAY

B
I
O
A
S
S
A
Y

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The straight part
We know that "Lab test" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lab test = bioassay.
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 BIOASSAY mean?

BIOASSAY noun
  1. The analysis of the biological activity of a substance, with reference to a standard preparation, using a culture of living cells, or a living creature.
BIOASSAY verb
  1. To carry out such an analysis.

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