The most common and most likely answer to this crossword clue is the 8 plus 5 letter word BEAUFORT SCALE
I've seen this crossword clue in The Times
B
E
A
U
F
O
R
T
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C
A
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More clues leading to the result BEAUFORT SCALE
Buddy explains!
The straight part
We know that "set of measurements" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case set of measurements = beaufort scale.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.