One previously learning the French for "siren"' (7)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

As in a couple of other clues the wordplay is a bit contorted, but I think it works: One (I) with, previously, LORE (learning) + LE (the French). A change from “rock singer” as a clue for Lorelei , anyway