Crossword Genius

Rhapsodize producing Mercury retrospective taking in all the states in America (4)

Ross

I believe the answer is:

gush

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'rhapsodize' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for gush that I've seen before include "Pour forth" , "Flood out - enthuse" , "Spout like oil-well" , "Flow unceasingly" , "Effuse" .)

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