Crossword Genius

To agree entirely (7)

Ross

I believe the answer is:

totally

'entirely' is the definition.
('totally' can be a synonym of 'entirely')

'to agree' is the wordplay.
'agree' becomes 'tally' ('tally' can be a synonym of 'agree').
'to'+'tally'='TOTALLY'

(Other definitions for totally that I've seen before include "Completely, entirely" , "Clean" , "to the nth degree" , "To the full extent" , "Fully, completely" .)

I've seen this clue in the Evening Standard.
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