Wildly enthusiastic (4)

I think it could be either:

Which length description are you looking for?:

avid

(Other definitions for gaga that I've seen before include "Doddery" , "Senile - slightly crazy" , "person who is senile?" , "fatuous?" , "Foolishly doting" .)

I've seen this clue in The Washington Post Sunday, the Wall Street Journal, the New York Times, the USA Today, the Universal and The Mirror.

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