Fluster some returning crate (10)

I believe the answer is:

rattletrap

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'crate' is the definition.
Both the definition and answer are singular nouns.
Maybe you can see a link between them that I don't see?

'fluster some returning' is the wordplay.
'fluster' becomes 'rattle' (I've seen this before).
'some' becomes 'part' (only part of something).
'returning' says the letters should be written in reverse.
'part' written backwards gives 'trap'.
'rattle'+'trap'='RATTLETRAP'

Can you help me to learn more?

(Other definitions for rattletrap that I've seen before include "jalopy" , "Old car" , "old vehicle" , "banger" , "Rickety vehicle" .)

I've seen this clue in The Times.

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