Ignores dried grass being threshed (10)
I believe the answer is:
disregards
'ignores' is the definition.
('disregard' can be a synonym of 'ignore')
'dried grass being threshed' is the wordplay.
'being threshed' is an anagram indicator (thresh can mean to hit or attack).
'dried'+'grass'='driedgrass'
'driedgrass' is an anagram of 'DISREGARDS'.
(Other definitions for disregards that I've seen before include "skips" , "Shows no interest in" .)