Call out a heroic nurse (6)

I believe the answer is:

cavell

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'nurse' is the definition.
(I have seen 'Wartime nurse' mean 'cavell' so perhaps 'nurse' could also mean 'cavell')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for cavell that I've seen before include "Edith, World War I heroine" , "Wartime nurse" , "Edith -, nurse executed in 1915" , "WWI nurse executed by Germans" , "I was shot by the Germans" .)

I've seen this clue in the Evening Standard.

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