Crossword Genius

Alert (5)

Ross

There are a few possibilities for this:

Which length description are you looking for?:

4 5 10

2,3,4

2,4,4 4-4 5*

'alert' is the definition.
(on the ball can mean alert or paying attention)

This is all the clue.

(Other definitions for on the ball that I've seen before include "Informally alert or competent, like good soccer player" , "like a balancing seal?" , "Alert and focused as soccer player should be" , "Ready to take initiative" , "Alert - informed" .)

I've seen this clue in the Evening Standard.
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