One having an eye for provocation? (6)
I believe the answer is:
needle
This clue is a double definition.
'one having an eye' is the first definition.
(the hole in a needle is its eye)
'provocation?' is the second definition.
(needle can mean to provoke or annoy)
'for' acts as a link.
(Other definitions for needle that I've seen before include "Knitting rod" , "has only one eye" , "Knitting item" , "Stiff leaf of a conifer" , "Instrument to annoy" .)