Crossword Genius

Austrian composer causes big problem for captain of ill-fated ship, in short (4)

Ross

I believe the answer is:

berg

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'austrian composer' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for berg that I've seen before include "famously cut short a transatlantic journey" , "Small version of ice mountain" , "South African hill - Austrian composer" , "Shipping hazard; composer" , "Mass of ice floating at sea" .)

I've seen this clue in The Irish Times.
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