Regarded a piece of rope as a good thing for the viewer (7)

I believe the answer is:

eyedrop

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'a good thing for the viewer' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'regarded a piece of rope as' is the wordplay.
'regarded' becomes 'eyed' (I've seen this in other clues).
'a piece of' indicates taking the first letters.
'as' becomes 'op' (I am not sure about this - if you are sure you should believe this answer much more).
The first letter of 'rope' is 'r'.
'eyed'+'r'+'op'='EYEDROP'

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I've seen this clue in the Evening Standard.

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