Language feature associated with Oxford? (6)

I believe the answer is:

tongue

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'language' is the definition.
(tongue can mean a language)

I cannot understand how the remainder of the clue works.

(Other definitions for tongue that I've seen before include "Muscular organ inthe mouth" , "spit" , "Organ of taste" , "Speech" , "Language; part of shoe" .)

I've seen this clue in The Times.

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