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Breeder and trainer mad about one ultimately? (8,7)

Ross

I believe the answer is:

aberdeen terrier

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

'breeder and trainer mad about one ultimately?' is the definition.
I can't judge whether this definition defines the answer.

'breeder and trainer mad about one ultimately?' is the wordplay.
'and' is a charade indicator (letters next to each other).
'mad' indicates anagramming the letters.
'about' is an insertion indicator.
'ultimately?' says to take the final letters (I've seen 'ultimately' mean this).
The last letter of 'one' is 'e'.
'breeder' after 'trainer' is 'trainerbreeder'.
'trainerbreeder' anagrammed gives 'abrdeenterrier'.
'abrdeenterrier' enclosing 'e' is 'ABERDEEN TERRIER'.

Can you help me to learn more?

(Another definition for aberdeen terrier that I've seen is " Dog".)

I've seen this clue in The Times and The Sunday Times.
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