Good dog! Fur finally more shiny (8)

I believe the answer is:

glassier

'more shiny' is the definition.
('glassy' can be similar in meaning to 'shiny')

'good dog fur finally' is the wordplay.
'good' becomes 'g' (abbreviation).
'dog' becomes 'lassie' (I've seen this before**).
'finally' indicates one should take the final letters.
The final letter of 'fur' is 'r'.
'g'+'lassie'+'r'='GLASSIER'

I've seen this clue in The Telegraph.

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