A bargee's exclamation (3)
I believe the answer is:
gee
'exclamation' is the definition.
(I have seen 'Mild exclamation' mean 'gee' so perhaps 'exclamation' could also mean 'gee')
'a bargee's' is the wordplay.
'GEE' is hidden within the letters.
However, I'm uncertain how the hidden word is indicated.
Can you help me to learn more?
(Other definitions for gee that I've seen before include "move faster" , "Golly" , "American exclamation" , "provided by substitute for ginger?" , "Exclamation of surprise" .)