Unusually slim models see English girls in Paris (14)
I believe the answer is:
mesdemoiselles
'girls in paris' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
'unusually slim models see english' is the wordplay.
'unusually' indicates an anagram.
'english' becomes 'E' (abbreviation).
'slim'+'models'+'see'+'e'='slimmodelsseee'
'slimmodelsseee' anagrammed gives 'MESDEMOISELLES'.
Can you help me to learn more?
(Another definition for mesdemoiselles that I've seen is " Nancy misses".)