The most common and most likely answer to this crossword clue is the 9 letter word STATIONER
I've seen this crossword clue in The Times
S
T
A
T
I
O
N
E
R
More clues leading to the result STATIONER
- Trader giving one artist supply
- Abstract artist keeping one in shop
- Pen pusher, perhaps, bursting into tears
- Burst into tears in paper shop
- High street shop where police located queen?
- Supplier of paper one artist ordered
- I may get in new order for artist?
- Shopkeeper burst into tears
- Shopkeeper
- Trader about to set up south of Paddington, say?
Buddy explains!

The straight part
We know that "paper shop" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case paper shop = stationer.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 STATIONER mean?
STATIONER noun- A person or business that sells stationery.