Crossword Genius

Some dirigibles, you may see, are quite different from a blimp (5)

Ross

I believe the answer is:

rigid

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

I can't explain the remainder of the clue.

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(Other definitions for rigid that I've seen before include "Stiff, unbending" , "starched too much?" , "completely" , "not relaxing" , "Stiff, unyielding" .)

I've seen this clue in the Evening Standard.
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