Section of tract: "USA Hopes Go Astray" (10)

I believe the answer is:

oesophagus

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'section of tract' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'usa hopes go astray' is the wordplay.
'astray' indicates an anagram.
'usa'+'hopes'+'go'='usahopesgo'
'usahopesgo' with letters rearranged gives 'OESOPHAGUS'.

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(Other definitions for oesophagus that I've seen before include "Throat to stomach link" , "Gullet" .)

I've seen this clue in The Times.

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