Crossword Genius

One scavenging some filthy enamel (5)

Ross

I believe the answer is:

hyena

I'm a little stuck... Click here to teach me more about this clue!

'one scavenging' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'some filthy enamel' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'HYENA' is hidden in the letters of 'filthy enamel'.

Can you help me to learn more?

(Other definitions for hyena that I've seen before include "Dog-like carrion eater" , "One laughs loud" , "Wolf-like animal with cry like laughter" , "Dog-like African carnivore" , "Carrion-eating mammal" .)

I've seen this clue in The Times.
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