Negative sort of person (5)
I believe the answer is:
cynic
'negative sort of person' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cynic that I've seen before include "Doubter of others' motives" , "Scoffer" , "Fault-finder" , "Person who is generally sceptical" , "One dismissive of human motives" .)