12 across
A
mother
with
energy
that’s
sensational
(7)
A mother with energy that’s sensational (7)
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The definition is at the end of the clue.
How the clue works
The definition is sensational. For the wordplay, you're building it up piece by piece: A from the clue, then MA for mother, then ZING for energy — put them together and there you have it.