Crossword Genius

Fail to acknowledge there is no spa in Singapore (6)

Ross

I believe the answer is:

ignore

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'fail' is the definition.
(thesaurus)

I don't understand how the rest of the clue works.

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(Other definitions for ignore that I've seen before include "Walk away from" , "Send to Coventry" , "Intentionally disregard" , "Discount" , "Dismiss" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).
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