It was beseiged but not fully destroyed (4)

I believe the answer is:

troy

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'it was beseiged' is the definition.
The definition suggests a singular noun which matches the answer.

'not fully destroyed' is the wordplay.
'TROY' is hidden within the letters.
But, I am unsure how this is indicated.

'but' acts as a link.

Can you help me to learn more?

(Other definitions for troy that I've seen before include "Besieged city which fell to Wooden Horse" , "Ancient city associated with a wooden horse" , "Priam's city" , "Ancient city besieged to free beautiful Helen" , "Wooden horse siege city" .)

I've seen this clue in the Evening Standard.

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