Dictionary the French team study (7)

I believe the answer is:

lexicon

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'dictionary' is the definition.
(I know that lexicon is a type of dictionary)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for lexicon that I've seen before include "set of terms" , "reference work?" , "Dictionary of terms" , "it has a lot of words" , "Wordbook" .)

I've seen this clue in The Sun and The Telegraph.

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