Crossword Genius

She's great but far from attractive (6)

Ross

I believe the answer is:

ogress

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

'she's' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

'great but far from attractive' is the wordplay.
I cannot quite understand how this works, but
'great' could be 'gr' (abbreviation used in place names) and 'gr' is found in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
The remaining letters 'ess' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for ogress that I've seen before include "Female man-eating giant" , "Female monster" , "Particular nasty woman" , "Giant woman" , "Some progressive" .)

I've seen this clue in The Globe and Mail.
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