End time involved in stirring a lot of potato soup (3,1,4,2)
I believe the answer is:
put a stop to
'end' is the definition.
(I've seen this in another clue)
'time involved in stirring a lot of potato soup' is the wordplay.
'time' becomes 't' (abbreviation).
'involved in' means one lot of letters goes inside another.
'stirring' is an anagram indicator.
'a lot of' means to remove the last letter (most of the word but not all of it).
'potato' with its final letter taken off is 'potat'.
'potat'+'soup'='potatsoup'
'potatsoup' with letters rearranged gives 'putasopto'.
't' going within 'putasopto' is 'PUT A STOP TO'.
(Another definition for put a stop to that I've seen is " Cause to end".)