Titanic problem for composer (4)
I believe the answer is:
berg
I believe this clue is a double definition.
'titanic problem' is the first definition.
(I've seen this in another clue)
'for composer' is the second definition.
(Alban Berg, 1885 - 1935)
(Other definitions for berg that I've seen before include "Mountain (in German, South African)" , "South African hill - Austrian composer" , "African mount" , "South African mountain - Austrian composer" , "ice in the drink" .)