27 across
Declared
dead
by
the
entrance
of
Serpentine
Gallery
(6)
Declared dead by the entrance of Serpentine Gallery (6)
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The definition is at the beginning of the clue.
How the clue works
The definition is Declared. For the wordplay, take S — the entrance (that is, the first letter) of Serpentine — then TATE, your Gallery, and finally D, the abbreviation for dead, and string them all together to get your answer.