Crossword Genius

As an alternative to a group of spacemen (4)

Ross

I believe the answer is:

nasa

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

'to a group of spacemen' is the definition.
I can't judge whether this defines the answer.

'as an alternative' is the wordplay.
'alternative' indicates anagramming the letters.
'as'+'an'='asan'
'asan' with letters rearranged gives 'NASA'.

Can you help me to learn more?

(Other definitions for nasa that I've seen before include "rocket launcher" , "US agency responsible for space flight" , "US headquarters for space exploration" .)

I've seen this clue in The Mirror.
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