Crossword Genius

How photograph in the dark is taken immediately? (2,1,5)

Ross

I believe the answer is:

in a flash

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

'immediately?' is the definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

'how photograph in the dark is taken' is the wordplay.
I cannot really see how this works, but
'in' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for in a flash that I've seen before include "pictures may be taken" , "How lightning appears" , "Instantly, straightaway" , "Very quickly" , "Where American detected electricity" .)

I've seen this clue in The Telegraph.
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