Nemesis rising, for example, over my dead body (7)
I believe the answer is:
revenge
'nemesis' is the definition.
(Nemesis is the Greek goddess of revenge)
'rising for example over my dead body' is the wordplay.
'rising' is a reversal indicator (going up in a down clue).
'for example' becomes 'e.g.' (synonyms).
'over my dead body' becomes 'never' (phrase meaning 'I will never let that happen').
'eg'+'never'='egnever'
'egnever' in reverse letter order is 'REVENGE'.
(Other definitions for revenge that I've seen before include "Retribution" , "Malicious retaliation" , "An eye for an eye" , "Ship remembered in verse" , "Satisfaction taken for injury" .)