This upset Goering no end, but take no notice! (6)
I believe the answer is:
ignore
'take no notice' is the definition.
(I've seen this before)
'this upset goering no end' is the wordplay.
'this upset' is an anagram indicator.
'no end' means to remove the last letter.
'goering' with its final letter taken off is 'goerin'.
'goerin' is an anagram of 'IGNORE'.
'but' is the link.
(Other definitions for ignore that I've seen before include "Region (anag)" , "Walk away from" , "Fail to observe" , "Region in which to snub" , "Disregard - cut" .)