Waste time after wise man embraces wife (8)
I believe the answer is:
sewerage
'waste' is the definition.
(sewerage is a kind of waste)
'time after wise man embraces wife' is the wordplay.
'time' becomes 'age' (age is a kind of time).
'after' means one lot of letters go next to another.
'wise man' becomes 'seer' (I've seen this in other clues).
'embraces' is an insertion indicator.
'wife' becomes 'w'.
'seer' placed around 'w' is 'sewer'.
'age' after 'sewer' is 'SEWERAGE'.
(Other definitions for sewerage that I've seen before include "System of drains to carry away waste" , "Provision of drainage" , "removal of waste matter" , "waste products" , "For removal of surplus water" .)