Violet and Saul removed optic (6)
I believe the answer is:
visual
'optic' is the definition.
('visual' can be a synonym of 'optic')
'violet and saul removed' is the wordplay.
'violet' becomes 'vi'.
'and' is a charade indicator (letters next to each other).
'removed' indicates an anagram (moved again).
'saul' is an anagram of 'sual'.
'vi'+'sual'='VISUAL'
(Other definitions for visual that I've seen before include "Of sight and seeing" , "Pertaining to sight" , "Relating to seeing" , "Of or used in seeing" , "Relating to, or using, sight" .)