Excellent coloured drink for dog (8)
I believe the answer is:
airedale
'dog' is the definition.
(Airedale is an example)
'excellent coloured drink' is the wordplay.
'excellent' becomes 'ai'.
'coloured' becomes 'red' ('red' can be similar in meaning to 'coloured').
'drink' becomes 'ale' (ale is a kind of drink).
'ai'+'red'+'ale'='AIREDALE'
'for' acts as a link.
(Other definitions for airedale that I've seen before include "Dog taking" , "Mutt" , "Large breed of terrier" , "Yorkshire valley" , "Terrier - Yorkshire area" .)