Crossword Genius

Sirius tops the canine bill (7)

Ross

I believe the answer is:

dogstar

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'sirius tops' is the definition.
I know nothing about this answer so I cannot tell whether this works.

'canine bill' is the wordplay.
'canine' becomes 'dog' (dog is a kind of canine).
'bill' becomes 'star' (I am not sure about this - if you are sure you should believe this answer much more).
'dog'+'star'='DOGSTAR'

'the' acts as a link.

Can you help me to learn more?

(Other definitions for dogstar that I've seen before include "animal on TV?" , "This the brightest" , "Bright night light" .)

I've seen this clue in The Irish News.
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