flauta

1. flute
   Moja ćerka svira flautu u školskom orkestru. — My daughter plays the flute in the school orchestra.
   Iz susedne sobe čuo se zvuk flaute. — The sound of a flute came from the next room.

As with other instruments, 'to play the flute' is svirati flautu (accusative, no preposition).