Addition with batsman not out of his ground (8)

I believe the answer is:

increase

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

'addition' is the definition.
(I know that addition can be written as increase)

'not out of his ground' is the wordplay.
'not out of' becomes 'in'.
'his ground' becomes 'crease' (I am not sure about this - if you are sure you should believe this answer much more).
'in'+'crease'='INCREASE'

'with batsman' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for increase that I've seen before include "extra money at work" , "Profit" , "Become greater in size" , "Make larger in a sincere way" , "Augment or enlarge (8)." .)

I've seen this clue in The Irish 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.