Stout fellow at junction (3)
I believe the answer is:
fat
'stout' is the definition.
(similar in meaning)
'fellow at junction' is the wordplay.
'fellow' becomes 'fa' (I am not sure about this - if you are sure you should believe this answer much more).
'at' says to put letters next to each other.
'junction' becomes 't'.
'fa'+'t'='FAT'
Can you help me to learn more?
(Other definitions for fat that I've seen before include "Obese, overweight" , "Portly" , "Cooking grease" , "Adipose tissue" , "Substantial" .)