The most common and most likely answer to this crossword clue is the 5 plus 4 letter word FIELD TEST
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More clues leading to the result FIELD TEST
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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 FIELD TEST mean?
FIELD TEST verb- To test something using the conditions that it was designed to operate under, especially out in the real world instead of in a laboratory or workshop.