Iceberg rolls, killing one Cape diver (5)

I believe the answer is:

grebe

I'm a little stuck... Click here to teach me more about this clue!

'diver' is the definition.
(diving bird)

'iceberg rolls killing one cape' is the wordplay.
'GREBE' is hidden back-to-front in amongst the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for grebe that I've seen before include "Diving waterbird" , "Small bird that builds floating nests" , "Swimmer" , "Crested water-bird" , "Flier" .)

I've seen this clue in The Times.

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