A Latin American percussion instrument consisting of a set of hardwood plates over tuned metal resonators (7)

I believe the answer is:

marimba

(Other definitions for marimba that I've seen before include "Xylophone-like instr." , "Latin American instrument like a xylophone" , "Jazz instrument" , "Xylophone-like instrument from Africa" , "Deep toned percussion instrument" .)

I've seen this clue in The Independent.

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