Bullfighter with no cojones a bit yellow, mother admits (8)

'bullfighter with no cojones' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'a bit yellow mother admits' is the wordplay.
'bit' becomes 'tad' (both can mean a small amount).
'yellow' becomes 'or' (heraldic term).
'mother' becomes 'ma' (Ma is another word for mother or mum).
'admits' indicates putting letters inside.
'a'+'tad'+'or'='atador'
'atador' placed inside 'ma' is 'MATADORA'.

Can you help me to learn more?