26 across
Use
energy,
and
old
giant
toppled
over
(5)
Use energy, and old giant toppled over (5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Use energy. You've got E for energy, then T-REX (that old giant) flipped upside down ("toppled over") to give XERT, and the two bits together make your answer.