At length, a child trained hairy bovines (8,6)

I believe the answer is:

highland cattle

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'at length a child trained hairy bovines' is the definition.
I can't judge whether this definition defines the answer.

'at length a child trained' is the wordplay.
'trained' indicates an anagram (train can mean to shape or manipulate).
'at'+'length'+'a'+'child'='atlengthachild'
'atlengthachild' is an anagram of 'HIGHLAND CATTLE'.

Can you help me to learn more?

(Another definition for highland cattle that I've seen is " Shaggy bovine breed".)

I've seen this clue in The Everyman puzzle in The Observer.

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