Refuse offer of pap rub from Spooner (5,4)

I believe the answer is:

waste pipe

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'spooner' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?

'refuse offer of pap rub' is the wordplay.
'refuse' becomes 'waste' (I've seen this before).
'offer of pap rub' becomes 'pipe' (I can't justify this - if you can you should give a lot more credence to this answer).
'waste'+'pipe'='WASTE-PIPE'

'from' acts as a link.

Can you help me to learn more?

I've seen this clue in The Independent.

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