The most common and most likely answer to this crossword clue is the 8 letter word CASHBACK
I've seen this crossword clue in The Daily Telegraph
C
A
S
H
B
A
C
K
Buddy explains!
The straight part
We know that "Bread that’s asked for at checkout?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bread that’s asked for at checkout? = cashback.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CASHBACK mean?
CASHBACK noun- The retail facility whereby a customer may withdraw an amount of cash when making a purchase with a credit card or debit card, the amount being added to the bill.