The most common and most likely answer to this crossword clue is the 7 letter word ANALYZE
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Buddy explains!
The straight part
We know that "Test" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case test = analyze.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 ANALYZE mean?
ANALYZE verb- To subject to analysis.
- To resolve (anything complex) into its elements.
- To separate into the constituent parts, for the purpose of an examination of each separately.
- To examine in such a manner as to ascertain the elements or nature of the thing examined; as, to analyze a fossil substance, to analyze a sentence or a word, or to analyze an action to ascertain its morality.