The most common and most likely answer to this crossword clue is the 3 plus 4 plus 4 letter word CAR BOOT SALE
I've seen this crossword clue in Independent
C
A
R
B
O
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S
A
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E
More clues leading to the result CAR BOOT SALE
- Sellers here driven to make money?
- Fair queen possibly shunning Duke of Wellington and porter
- Hammer close to a bar for field event?
- October alas misjudged for popular form of retail?
- Bargains to be had here in a bar close to ground
- Alas October is disastrous for cheap domestic disposal
- Move close to a bar where trade can be done
- Irregularly, a clear profit’s taken in unofficial market
- Concern about profits almost entirely seen in marketplace?
- Informal market offering mostly crap, perhaps: footwear, booze
Buddy explains!
The straight part
We know that "popular form of retail" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case popular form of retail = car boot sale.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.