Infection consuming upper-class womaniser (4)
I believe the answer is:
stud
'womaniser' is the definition.
The definition and answer can be both people as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'infection consuming upper-class' is the wordplay.
'infection' becomes 'std' (I can't justify this - if you can you should believe this answer much more).
'consuming' indicates putting letters inside.
'upper-class' becomes 'u' (similar in meaning).
'std' enclosing 'u' is 'STUD'.
Can you help me to learn more?
(Other definitions for stud that I've seen before include "sort of stable" , "Bolt" , "Small piece of jewellery" , "Large-headed nail" , "Clothes fastener in horse establishment" .)