Verily mourn peeling (4)
I believe the answer is:
amen
'verily' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for amen that I've seen before include "Conclusion of prayer" , "Last word of prayer" , "Word of approval" , "Religiously 11 [THE LASTWORD]" , "as agreed!" .)