One man's name for a jinx (5)
I believe the answer is:
jonah
'a jinx' is the definition.
(I know that jinx can be written as jonah)
'one man's name for' is the wordplay.
'one man' becomes 'Jon'.
'name for' becomes 'ah' (I can't explain this - if you can you should believe this answer much more).
'jon'+'ah'='JONAH'
Can you help me to learn more?
(Other definitions for jonah that I've seen before include "One who brings bad luck, like Hebrew prophet." , "Biblical prophet" , "Whalemeat prophet" , "Prophet - bringer of bad luck" , "In Old Testament, he was swallowed by a great fish" .)