The most common and most likely answer to this crossword clue is the 10 plus 5 letter word DEPARTMENT STORE
I've seen this crossword clue in The Daily Telegraph
D
E
P
A
R
T
M
E
N
T
S
T
O
R
E
More clues leading to the result DEPARTMENT STORE
- Wildly remonstrated with pet shop
- Leave coach, crossing street and beginning to explore large shop
- Craftily, trader tempts one in a place on the high street
- Harrods to take one hard look following conduct in vocal exchange
- High street with random pet shop
- Traders tempt one wickedly in shop
- Disorderly temp arrested – not in Harrods, maybe
- Tradesmen potter about in large retail site
- Leave fellows having time with stock for large shop
Buddy explains!
The straight part
We know that "large retail site" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large retail site = department store.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.