Crossword Genius

To finish up best (3)

Ross

I believe the answer is:

top

'best' is the definition.
(top can mean the very best)

'to finish up' is the wordplay.
'finish' suggests halving the letters.
'up' halved is 'p'.
'to'+'p'='TOP'

(Other definitions for top that I've seen before include "Children's toy" , "Upper side" , "Toy; uppermost point" , "The circus tent can be a big one" , "jumper, say?" .)

I've seen this clue in the Evening Standard.
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