Arching in mortification (7)
I believe the answer is:
chagrin
'mortification' is the definition.
(I know that mortification can be written as chagrin)
'arching' is the wordplay.
'arching' anagrams to 'CHAGRIN'.
Though, I am unsure how the anagram is indicated.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for chagrin that I've seen before include "anything but delight" , "Arching with annoyance and embarrassment" , "Annoyance/shame at one's failure" , "Embarrassment - rich nag (anag)" , "Feeling of annoyance and embarrassment" .)