Big race displaced structure protecting lights

I believe the answer is:

ribcage

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'structure protecting lights' is the definition.
The definition suggests a singular noun which matches the answer.

'big race displaced' is the wordplay.
'displaced' indicates an anagram.
'big'+'race'='bigrace'
'bigrace' is an anagram of 'RIBCAGE'.

Can you help me to learn more?

(Other definitions for ribcage that I've seen before include "bone formation" , "Frame round the chest" , "protects one's heart" , "Bone structure of chest wall" , "skeletal frame" .)

I've seen this clue in The Daily Mail.

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