12 across
Sound
measure
could
be
credible
–
not
right!
(7)
Sound measure could be credible – not right! (7)
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hints
The definition is at the beginning of the clue.
How the clue works
The definition is Sound measure — a unit of sound intensity. For the wordplay, take "credible" and remove the R (that's "not right!"), leaving you with C-E-D-I-B-L-E, and then "could be" tells you to anagram those letters to get your answer.