Crossword Genius

French in grotto round lake: area surrounded (7)

Ross

I believe the answer is:

enclave

I'm a little stuck... Click here to teach me more about this clue!

'french in grotto round' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for enclave that I've seen before include "Enclosed piece of territory" , "Part of country surrounded by foreign territory" , "Isolated cultural group" , "Isolated territory enclosed by valence" , "Territory enclosed within another one" .)

I've seen this clue in The Sun.
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