Crossword Genius

To love more than reasonably (3)

Ross

I believe the answer is:

too

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'reasonably' is the definition.
Both the answer and definition are adverbs. Perhaps they are linked in a way I don't understand?

'to love more' is the wordplay.
'love' becomes 'o' (love means zero in tennis).
'more' says to put letters next to each other (some letters added to the previous ones).
'to'+'o'='TOO'

'than' is the link.

Can you help me to learn more?

(Other definitions for too that I've seen before include "To a greater than desirable extent" , "Unduly" , "Also; overly" , "Excessively" , "What a pity!" .)

I've seen this clue in the Evening Standard.
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