Wrath involving large one catching fish? (6)
I believe the answer is:
angler
'one catching fish?' is the definition.
'wrath involving large' is the wordplay.
'wrath' becomes 'anger' ('anger' can be a synonym of 'wrath').
'involving' indicates putting letters inside.
'large' becomes 'l'.
'anger' going around 'l' is 'ANGLER'.
(Other definitions for angler that I've seen before include "Isaac Walton wrote of the 'Compleat' one" , "Sportsman" , "Fisher with rod and line" , "One hoping for a catch" , "Hook and line fisherman" .)