Brotherly bunkum? (3)
I believe the answer is:
rot
'bunkum?' is the definition.
('rot' can be a synonym of 'bunkum')
'brotherly' is the wordplay.
'ROT' is hidden in amongst the letters.
However, I'm unsure how this is indicated.
Can you help me to learn more?
(Other definitions for rot that I've seen before include "Decay or disintegrate" , "Decay, moulder" , "Corruption" , "Drivel" , "Decay in grotesque way" .)