To balance completely (7)

I believe the answer is:

totally

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'completely' is the definition.
(I know that completely can be written as totally)

'to balance' is the wordplay.
'balance' becomes 'tally' (I can't justify this - if you can you should believe this answer much more).
'to'+'tally'='TOTALLY'

Can you help me to learn more?

(Other definitions for totally that I've seen before include "in every respect" , "Wholly" , "Fully, completely" , "Dead" , "Completely, entirely" .)

I've seen this clue in The Irish Independent.

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