Crossword Genius

A name for certain parts of a horoscope (6)

Ross

I believe the answer is:

roscoe

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

'a name for certain parts of' is the wordplay.
I cannot really understand how this works, but
'name' could be 'ros' and 'ros' is present in the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Evening Standard.
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