Crossword Genius

...turns before leading advances (4,5)

Ross

I believe the answer is:

gets ahead

'advances' is the definition.
('get ahead' can be a synonym of 'advance')

'turns before leading' is the wordplay.
'turns' becomes 'gets' (getting is a kind of turning).
'before' is a charade indicator (letters next to each other).
'leading' becomes 'ahead' (to lead is to go ahead).
'gets'+'ahead'='GETS AHEAD'

(Another definition for gets ahead that I've seen is " Takes the lead".)

I've seen this clue in The Daily Express.
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