Mortal; person (5)
I believe the answer is:
human
I believe this clue is a double definition.
'mortal' is the first definition.
(synonyms)
'person' is the second definition.
(I know that person can be written as human)
(Other definitions for human that I've seen before include "Fallible - person" , "Not divine, animal or mechanical" , "Like a real person" , "Of the species of homo sapiens" , "likely to err?" .)