Perennial work in field accepted by group of brothers (10)
I believe the answer is:
fritillary
'field accepted by group of brothers' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'perennial work in' is the wordplay.
'perennial' becomes 'friary' (I can't explain this - if you can you should believe this answer much more).
'work' becomes 'till' (to till is to work the land).
'in' is an insertion indicator.
'friary' going around 'till' is 'FRITILLARY'.
Can you help me to learn more?
(Other definitions for fritillary that I've seen before include "Plant of the lily family" , "Sort of lily" , "Butterfly" .)