With which one suffers a lack of balance (9)

I believe the answer is:

overdraft

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

'balance' is the definition.
(I have seen 'Red balance ' mean 'overdraft' so perhaps 'balance' could also mean 'overdraft')

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for overdraft that I've seen before include "Red balance" , "financial licence" , "money that must be repaid" , "Bank borrowing" , "Excess withdrawal from bank" .)

I've seen this clue in The Irish News, The Guardian and The Globe and Mail.

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.