Crossword Genius

Twain being spoken of, also (3)

Ross

I believe the answer is:

too

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

'also' is the definition.
(I know that also can be written as too)

'twain being spoken of' is the wordplay.
I cannot really understand how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'to' 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 too that I've seen before include "To a greater than desirable extent" , "Furthermore" , "As well; in addition" , "Likewise" , "As well, also" .)

I've seen this clue in the Evening Standard.
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