Answer: arare

AnswerCrossword Clue
ARARE

".... bird on earth, comparable to a black swan"

ARARE

"It's ... treat"

ARARE

"What ... mood I'm in . . . "

ARARE
"... bird upon the earth . . . ": Juvenal
ARARE
"What ... mood I'm in ..."
ARARE"He's ... breed!" (backhanded compliment)
ARARESympathetic to .... degree