The most common and most likely answer to this crossword clue is the 4 plus 8 letter word CASH REGISTER
I've seen this crossword clue in Financial Times
C
A
S
H
R
E
G
I
S
T
E
R
More clues leading to the result CASH REGISTER
- Till around tree log
- Assortment of cigars there’s to be found in a shop
- Till old C&W singer is in wasted regret
- Till career, sights must be managed
- Caterer sighs when moving box full of bread
- & 5d Till charges worked out, I rest uneasily
- 14 Ready to book what’s found in a store
- ...till Charlie remains on record
Buddy explains!
The straight part
We know that "Till" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case till = cash register.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.