Fellows regularly glimpsed Rhett and O'Hara in first half of Oscar-winning film (8)
I believe the answer is:
'fellows' is the definition.
The definition and answer can be both people as well as being plural nouns.
Perhaps you can see a link between them that I don't see?
'regularly glimpsed rhett and o'hara in first half of oscar-winning film' is the wordplay.
I cannot really see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
'film' could be 'et' (E.T. the Extra-Terrestrial) and 'et' is found in the answer.
'first half' could be 'h' (1st letter of 'half') and 'h' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for brethren that I've seen before include "Members of Society" , "Biblical or other old brothers" , "Kindred" , "Lay members of a male religious order" , "Church members" .)