Bomber group carries a threat to shipping (4)

I believe the answer is:

berg

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'a threat to shipping' is the definition.
I can't tell whether this defines the answer.

'bomber group carries' is the wordplay.
'carries' says the answer is hidden in the clue.
'BERG' is hidden in the letters of 'bomber group'.

Can you help me to learn more?

(Other definitions for berg that I've seen before include "African mount" , "South African mountain - Austrian composer" , "ice in the drink" , "Mountain (in German, South African)" , "Mountain; Alban --, composer" .)

I've seen this clue in The Times.

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