Sibling repaired chain and inner tubes (8)

I believe the answer is:

bronchia

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'inner tubes' is the definition.
Both the definition and answer are plural nouns.
Perhaps they are linked in a way I don't understand?

'sibling repaired chain' is the wordplay.
'sibling' becomes 'bro' (I've seen this before).
'repaired' indicates anagramming the letters.
'chain' is an anagram of 'nchia'.
'bro'+'nchia'='BRONCHIA'

'and' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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