Viewer not quite so blind (7)

I believe the answer is:

eyeless

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'quite so blind' is the definition.
'eyeless' can be an answer for 'blind' (similar in meaning). I'm unsure of the 'quite so' bit.

'viewer not' is the wordplay.
'viewer' becomes 'eye' (organ which sees or views).
'not' becomes 'less' (I've seen this in other clues).
'eye'+'less'='EYELESS'

Can you help me to learn more?

(Other definitions for eyeless that I've seen before include "Like Samson in Gaza" , "Without the means to see" , "lacking some perception" , "how needle may be defective" , "Unable to see" .)

I've seen this clue in The Daily Express.

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