Stout Fanny Adams at junction (3)
I believe the answer is:
fat
'stout' is the definition.
('fat' can be similar in meaning to 'stout')
'fanny adams at junction' is the wordplay.
'fanny adams' becomes 'fa'.
'at' is a charade indicator (letters next to each other).
'junction' becomes 't'.
'fa'+'t'='FAT'
(Other definitions for fat that I've seen before include "Greasy substance" , "Excess body weight" , "Corpulent; little (chance)" , "Portly" , "As Bunter" .)