Crossword Genius

A top up (5)

Ross

I believe the answer is:

ahead

'up' is the definition.
(similar in meaning)

'a top' is the wordplay.
'top' becomes 'head' (head is a kind of top).
'a'+'head'='AHEAD'

(Other definitions for ahead that I've seen before include "In the leading position" , "at pole" , "advanced" , "In the future" , "What's down the road" .)

I've seen this clue in The Times and The Sun.
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