At every launch, NASA's inventors must break up storm cloud (6)

I believe the answer is:

nimbus

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

'storm cloud' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for nimbus that I've seen before include "Large rain cloud; halo" , "A black rain cloud" , "Storm cloud" , "Dirty cloud; saintly light" , "A kind of rain-cloud, or 15 Across" .)

I've seen this clue in The Independent.

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