Discount, disregard (6)
I believe the answer is:
ignore
I believe this is a double definition.
'discount' is the first definition.
(I know that discount can be written as ignore)
'disregard' is the second definition.
(I know that disregard can be written as ignore)
(Other definitions for ignore that I've seen before include "Fail to notice (6)" , "Cut head off" , "Deliberately disregard" , "Fail to consider" , "bypass" .)