Memorable place for Texans that Omaha let become ruined (3,5)

I believe the answer is:

the alamo

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'memorable place' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'texans that omaha let become ruined' is the wordplay.
'omaha let' anagrams to 'THE ALAMO'.
However, I'm not clear how the anagram is indicated.

'for' acts as a link.

Can you help me to learn more?

(Another definition for the alamo that I've seen is " battle site".)

I've seen this clue in The Irish Times.

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