White male American trainee learning how to use guns? (8)

I believe the answer is:
muscadet
'learning how to use guns?' is the definition.
I can't tell whether this defines the answer.
'white male american trainee' is the wordplay.
'white male' becomes 'm' (common abbreviation. I am not sure about the 'white' bit.).
'american' becomes 'US' (abbreviation for United States).
'trainee' becomes 'cadet' (cadet is a kind of trainee).
'm'+'us'+'cadet'='MUSCADET'
Can you help me to learn more?
(Other definitions for muscadet that I've seen before include "Dry French white wine" , "drink" , "White wine variety" , "one of the Whites" , "Dry white wine from the Loire valley" .)
