It's not the trainer who's the b..... scoundrel! (6)

I believe the answer is:

brogue

I'm a little stuck... Click here to teach me more about this clue!

'it's not the trainer who's' is the definition.
I can't tell whether this definition defines the answer.

'b scoundrel' is the wordplay.
'scoundrel' becomes 'rogue' (rogue is a kind of scoundrel).
'b'+'rogue'='BROGUE'

'the' is the link.

Can you help me to learn more?

(Other definitions for brogue that I've seen before include "Oxford" , "Kind of shoe" , "Style of shoe - style of accent" , "afoot?" , "Strong outdoor shoe" .)

I've seen this clue in the Evening Standard.

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