Crossword Genius

New car is not impregnable (4-4)

Ross

I believe the answer is:

cast-iron

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

'impregnable' is the definition.
Both the definition and answer are adjectives. Perhaps you can see an association between them that I can't see?

'new car is not' is the wordplay.
'new' indicates an anagram.
'car'+'is'+'not'='carisnot'
'carisnot' is an anagram of 'CAST-IRON'.

Can you help me to learn more?

(Other definitions for cast-iron that I've seen before include "Unassailable" , "Firm and unchangeable" , "Rigid, unyielding" , "Very strong" , "Unbreakable" .)

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