Crossword Genius

Destroys what’s left of a building (5)

Ross

I believe the answer is:

ruins

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'destroys' is the definition.
('ruin' can be a synonym of 'destroy')

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ruins that I've seen before include "Damaged remains (of building)" , "dilapidated buildings" , "Broken-down remnants" , "Remains to be seen" , "Mars" .)

I've seen this clue in The Mirror.
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