Waste visit, being interrupted by joker (6)
I believe the answer is:
sewage
'waste' is the definition.
(I've seen this before)
'visit being interrupted by joker' is the wordplay.
'visit' becomes 'see' (seeing is a kind of visiting).
'being interrupted by' is an insertion indicator.
'joker' becomes 'wag' (I've seen this before).
'see' placed around 'wag' is 'SEWAGE'.
(Other definitions for sewage that I've seen before include "Refuse for drains" , "Effluence" , "Liquid waste" , "Waste from toilets" , "Waste water, etc" .)