Hunter with dreadful curse has to be kept inside (8)
I believe the answer is:
chasseur
'hunter' is the definition.
(archaic term for a hunter)
'dreadful curse has to be kept inside' is the wordplay.
'dreadful' is an anagram indicator.
'to be kept inside' indicates putting letters inside.
'curse' with letters rearranged gives 'cseur'.
'cseur' going around 'has' is 'CHASSEUR'.
'with' is the link.
(Other definitions for chasseur that I've seen before include "Cooked with French sauce of wine, mushroom etc." , "(Cooked in) white wine and mushroom sauce" , "French sauce, cooked with wine, mushrooms, etc." , "A way of cooking" .)