April due to be made a back number? (8)

I believe the answer is:

epidural

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'a back number?' is the definition.
The definition suggests a singular noun which matches the answer.

'april due to be' is the wordplay.
'to be' indicates an anagram.
'april'+'due'='aprildue'
'aprildue' anagrammed gives 'EPIDURAL'.

'made' is the link.

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(Other definitions for epidural that I've seen before include "Anaesthetic injected into the spinal cord" , "Painkiller" , "Injection of anaesthetic into the spinal cord" , "Anaesthetic used in childbirth" .)

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

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