Crossword Genius

One watching six sheep by river (6)

Ross

I believe the answer is:

viewer

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'one watching' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

'six sheep by river' is the wordplay.
'six' becomes 'VI' (Roman numerals).
'sheep' becomes 'ewe' (a ewe is a female sheep).
'by' means one lot of letters go next to another.
'river' becomes 'r' (abbreviation for river).
'vi'+'ewe'+'r'='VIEWER'

Can you help me to learn more?

(Other definitions for viewer that I've seen before include "One watching, eg, TV" , "Observer" , "Onlooker" , "Review for TV watcher" , "One seeing" .)

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