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Parasite ravaged wing or room (8)

Ross

I believe the answer is:

ringworm

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'parasite' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'ravaged wing or room' is the wordplay.
'ravaged' indicates an anagram.
'room' becomes 'rm' (I've seen this in other clues).
'wing'+'or'='wingor'
'wingor' with letters rearranged gives 'ringwo'.
'ringwo'+'rm'='RINGWORM'

Can you help me to learn more?

(Other definitions for ringworm that I've seen before include "Problem with skin" , "Tinea" , "Fungal infection of the skin characterised by round patches" , "ailment" , "Skin disease" .)

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