It's kept in suspense when green card gets stolen at random (7,6)

I believe the answer is:

newtons cradle

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'it's kept in suspense' is the definition.
I know nothing about this answer so I can't judge whether this works.

'green card gets stolen at random' is the wordplay.
'green' becomes 'new' (I've seen this in another clue).
'gets' says to put letters next to each other.
'at random' indicates an anagram.
'card'+'stolen'='cardstolen'
'cardstolen' is an anagram of 'tonscradle'.
'new'+'tonscradle'='NEWTONS CRADLE'

'when' is the link.

Can you help me to learn more?

(Other definitions for newtons cradle that I've seen before include "Toy with impacting balls" , "Executive toy" , "restful for young Isaac?" .)

I've seen this clue in the Sydney Morning Herald.

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