State of a famous tall building (6)

I believe the answer is:

empire

I'm a little stuck... Click here to teach me more about this clue!

'state' is the definition.
(Empire State is an example)

I can't explain the remainder of the clue.

(Other definitions for empire that I've seen before include "Former British-ruled countries" , "Over which 23 down rules" , "Supreme power over many countries" , "See 5" , "Kingdom" .)

I've seen this clue in the Evening Standard.

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