Decline sees everything cancelled after fine (4,3)
I believe the answer is:
fall off
'decline' is the definition.
(thesaurus)
'everything cancelled after fine' is the wordplay.
'everything' becomes 'all' (I've seen this before).
'cancelled' becomes 'off' ('off' can be similar in meaning to 'cancelled').
'after' means one lot of letters go next to another.
'fine' becomes 'f' (abbreviation).
'all'+'off'='alloff'
'alloff' put after 'f' is 'FALL OFF'.
'sees' is the link.
(Other definitions for fall off that I've seen before include "Decline" , "How unsuccessful tightrope walker might" , "Decrease" , "deteriorate" , "Deterioration" .)