Crossword Genius

In favour of stuffing exhaust pipe with discarded material (5,7)

Ross

I believe the answer is:

waste product

'discarded material' is the definition.

'in favour of stuffing exhaust pipe' is the wordplay.
'in favour of' becomes 'pro' (I've seen this before).
'stuffing' indicates putting letters inside.
'exhaust' becomes 'waste'.
'pipe' becomes 'duct'.
'waste'+'duct'='wasteduct'
'pro' put inside 'wasteduct' is 'WASTE PRODUCT'.

'with' acts as a link.

(Another definition for waste product that I've seen is " substance passed through".)

I've seen this clue in The Independent.
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