The wake of the fart knocked over mother (9)
I believe the answer is:
aftermath
'the wake' is the definition.
('aftermath' can be a synonym of 'wake')
'the fart knocked over mother' is the wordplay.
'knocked' indicates anagramming the letters.
'over' means one lot of letters goes inside another.
'mother' becomes 'ma' (ma is a kind of mother).
'the'+'fart'='thefart'
'thefart' is an anagram of 'afterth'.
'afterth' enclosing 'ma' is 'AFTERMATH'.
'of' acts as a link.
(Other definitions for aftermath that I've seen before include "Circumstances that follow as a result of something" , "Consequence of an event, situation that follows" , "Sequel" , "Wake" , "Consequential circumstances" .)