12 across
Your
fault
every
now
and
then,
to
get
mouthy?
(4)
Your fault every now and then, to get mouthy? (4)
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The definition is at the end of the clue.
How the clue works
The definition is mouthy? — as in relating to the mouth. Then "every now and then" is your signal to pick out every other letter from your fault, and if you pluck out the alternating ones you get O-R-A-L.