Parasite ravaged wing or room (8)
I believe the answer is:
ringworm
'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" .)