Throw a cradle into mountain top? (7)

I believe the answer is:

caldera

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'mountain top?' is the definition.
The definition suggests a singular noun which matches the answer.

'throw a cradle' is the wordplay.
'throw' indicates anagramming the letters.
'a'+'cradle'='acradle'
'acradle' anagrammed gives 'CALDERA'.

'into' acts as a link.

Can you help me to learn more?

(Other definitions for caldera that I've seen before include "Result of eruption" , "Large volcanic crater -- lead car (anag)" , "Basin-shaped crater at top of volcano" , "Big hole in rock" , "Large volcanic crater - race lad (anag)" .)

I've seen this clue in The Mirror.

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