Crossword Clue:

an extraordinary one of its kind

AnswerCrossword Clue
SINGLETONOne of its kind.
AMINORKey in an Alicia Keys album title (though only one of its songs is in it)
GREECEIts one-euro coins depict an owl
PAMProduct that becomes an item to which it's applied after shifting the last letter one spot down in the alphabet