Device placed under a tongue (8)

I believe the answer is:

shoetree

(Other definitions for shoetree that I've seen before include "Shaped block for keeping footwear in condition" , "Device to keep footwear in good shape" , "A shaped block for holding footwear" , "what's found in Oxford?" , "Device put into footwear to maintain shape" .)

I've seen this clue in The New York Times.

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