Rubbish! Varona raise oxen to get dietary disorder? (8,7)

I believe the answer is:

anorexia nervosa

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'dietary disorder?' is the definition.
The definition suggests a singular noun which matches the answer.

'rubbish varona raise oxen' is the wordplay.
'rubbish' indicates an anagram (a poor quality or rubbish spelling of the letters).
'varona'+'raise'+'oxen'='varonaraiseoxen'
'varonaraiseoxen' anagrammed gives 'ANOREXIA NERVOSA'.

'to get' acts as a link.

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.

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