26 across
Stiff,
wow,
having
died
inside!
(4)
Stiff, wow, having died inside! (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Stiff, slang for a corpse. For the wordplay, think of "Boy!" as an exclamation of surprise (your "wow"), then pop D — the abbreviation for died — inside it to get BO-D-Y.