Resistant to virus in back of duodenum, misplaced (6)
I believe the answer is:
immune
'resistant' is the definition.
(I know that resistant can be written as immune)
'back of duodenum misplaced' is the wordplay.
'back' is a reversal indicator.
'of' indicates the answer is hidden within the clue.
'enummi' can be found hidden inside 'duodenum misplaced'.
'enummi' in reverse letter order is 'IMMUNE'.
'to virus in' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for immune that I've seen before include "Cannot be infected" , "Safe from infection etc" , "Resistant (to infection)" , "Not liable to, perhaps disease" , "Not subject or liable to" .)