Mont. neighbor (1,3)

I think it could be either:

Which length description are you looking for?:

1,3

ida

(Other definitions for ida that I've seen before include "'Princess - - ' (G & S)" , "The girl for Dai" , "Girl's name; aid (anag.)" , "musical princess" , "Trojan Mount; G&S Princess" .)

I've seen this clue in The Wall Street Journal and the LA Times.

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