Another US canal breaks (7)

I believe the answer is:

lacunas

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'breaks' is the definition.
Although both the answer and definition are plural nouns, I can't see how they can define each other.

'another us canal' is the wordplay.
'another' indicates anagramming the letters.
'us'+'canal'='uscanal'
'uscanal' anagrammed gives 'LACUNAS'.

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I've seen this clue in The Guardian.

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