Freshened beer for dog (8)
I believe the answer is:
airedale
'for dog' is the definition.
(Airedale is an example)
'freshened beer' is the wordplay.
'freshened' becomes 'aired' (airing is a kind of freshening).
'beer' becomes 'ale' (type of beer).
'aired'+'ale'='AIREDALE'
(Other definitions for airedale that I've seen before include "Barker" , "Mutt" , "A leader I turn into a large breed of dog" , "Terrier - Yorkshire area" , "part of Yorkshire" .)