Optical (6)

I believe the answer is:

visual

'optical' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for visual that I've seen before include "Of the eyes or sight" , "Pertaining to sight" , "Relating to, or using, sight" , "Of or used in seeing" , "Of sight and seeing" .)

I've seen this clue in the Sydney Morning Herald, the King Feature Syndicate, the Evening Standard and The Irish Times.

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