Sir Jacob ___, American-born sculptor who became a British citizen in 1911 (7)
I believe the answer is:
epstein
(Other definitions for epstein that I've seen before include "American-born British sculptor, d. 1959" , "British sculptor, d. 1959 - Beatles manager, d. 1967" , "Sir Jacob ..., sculptor noted for his statues of the famous" , "old artist" , "produced a few bronzes" .)