US philanthropist who endowed libraries (8)
I believe the answer is:
carnegie
'us philanthropist who endowed libraries' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for carnegie that I've seen before include "Andrew ........, Scottish philanthropist; or New York concert Hall" , "US philanthropist who endowed libraries" , "Scottish-born US steel magnate and philanthropist, d. 1919" , "US philantropist who endowed libraries" , "Andrew ..., famous American philanthropist" .)