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Shades grass area where vision obscured (5,4)

Ross

I believe the answer is:

blind spot

I'm a little stuck... Click here to teach me more about this clue!

'area where vision obscured' is the definition.
I can't tell whether this definition defines the answer.

'shades grass' is the wordplay.
'shades' becomes 'blinds' (I've seen this in another clue).
'grass' becomes 'pot' (cannabis).
'blinds'+'pot'='BLIND SPOT'

Can you help me to learn more?

(Other definitions for blind spot that I've seen before include "Hazard for driver" , "source of misunderstanding?" , "Area where vision is obstructed" , "where one cannot see" , "Area where understanding is lacking or one is unsighted" .)

I've seen this clue in The Sun.
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