Crossword Genius

Nice tutors freely smile and seemed so willing at heart (14)

Ross

I believe the answer is:

mesdemoiselles

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

'nice tutors' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for mesdemoiselles that I've seen is " Nancy misses".)

I've seen this clue in The Telegraph.
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