Sure sign revealing a batsman's ambitions? (10)

I believe the answer is:

boundaries

I'm a little stuck... Click here to teach me more about this clue!

'a batsman's ambitions?' is the definition.
The answer and definition can be both human attributes as well as being plural nouns.
Perhaps there's an association between them I don't understand?

'sure sign' is the wordplay.
'sure' becomes 'bound' ('bound' can be a synonym of 'sure').
'sign' becomes 'aries' (star sign).
'bound'+'aries'='BOUNDARIES'

'revealing' acts as a link.

Can you help me to learn more?

(Other definitions for boundaries that I've seen before include "Borders" , "Limits" .)

I've seen this clue in The Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.