Meaning of やくしゃばか in Japanese

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Definition of やくしゃばか

やくしゃばか(yakushabaka) 【役者馬鹿】

(n) good actor who is inept in all other matters; demon for acting who is utterly indifferent to all other concerns; skilled actor who knows little of life; person who excels in one occupation (profession) but lacks simple common sense