At no time twice lose nerve (5,5)

I believe the answer is:

never never

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

'lose nerve' is the definition.
I can't judge whether this defines the answer.

'at no time twice' is the wordplay.
'at no time' becomes 'never' (synonyms).
'twice' indicates the doubling of some letters.
'never' duplicated is 'NEVER-NEVER'.

Can you help me to learn more?

(Other definitions for never never that I've seen before include "form of purchase" , "Australian outback" , "remote, desolate place" .)

I've seen this clue in the Sydney Morning Herald.

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