Dislike remarkable rise in river (8)
I believe the answer is:
aversion
'dislike' is the definition.
(aversion is a kind of dislike)
'remarkable rise in river' is the wordplay.
'remarkable' is an anagram indicator.
'in' means one lot of letters goes inside another.
'river' becomes 'avon' (I've seen this before).
'rise' with letters rearranged gives 'ersi'.
'ersi' inserted within 'avon' is 'AVERSION'.
(Other definitions for aversion that I've seen before include "A version of strong dislike" , "A feeling of dislike or reluctance" , "A strong dislike or repugnance" , "Feeling of intense dislike" , "Strong disinclination" .)