Holy errand? (7)
I believe the answer is:
mission
This could be a double definition.
'holy' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'errand?' is the second definition.
(both can mean a task)
Can you help me to learn more?
(Other definitions for mission that I've seen before include "1996 Tom Cruise spy film -- extremely dangerous assignment" , "In religious campaign" , "important business" , "Assignment; expedition" , "Vocation; embassy" .)