Crossword Genius

Collie, say, could be a speed-hog (5,3)

Ross

I believe the answer is:

sheep dog

'collie say' is the definition.
(collie is a kind of sheep dog)

'could be a speed-hog' is the wordplay.
'could be' is an anagram indicator.
'speed'+'hog'='speedhog'
'speedhog' anagrammed gives 'SHEEP DOG'.

I've seen this clue in the Sydney Morning Herald.
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