Out in front (5)
![Ross](/clue/static/ross-mug.min.png)
'out in front' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for ahead that I've seen before include "In the lead, in advance" , "Forward - in front" , "in van" , "In the vanguard" , "Winning" .)
(Other definitions for leading that I've seen before include "Guiding by going in front" , "Most important; ahead" , "Principal" , "Foremost" , "Main" .)