Broadcast: 'Beer is man's best friend' (8)

I believe the answer is:

airedale

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'man's best friend' is the definition.
I can't judge whether this definition defines the answer.

'broadcast beer' is the wordplay.
'broadcast' becomes 'aired' ('aired' can be a synonym of 'broadcast').
'beer' becomes 'ale' (I've seen this before).
'aired'+'ale'='AIREDALE'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for airedale that I've seen before include "part of Yorkshire" , "Dog taking" , "Dog from Yorkshire" , "A leader I turn into a large breed of dog" , "Large breed of terrier" .)

I've seen this clue in The Telegraph.

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