also: でけもの
noun
able person; fine person
Refers to a person of outstanding ability or character; somewhat old-fashioned and now less common in everyday speech.
彼は若いがなかなかの出来物だ。
He is young but quite an able person.
出来 is a general noun meaning result, quality, or outcome, while 出来物 specifically refers to a person of fine quality.
Compound of 出来 (result, quality) and 物 (thing, person). The exact historical derivation is uncertain, but the word has been used to refer to a person of fine make or ability.