Cryptic crossword clue
Volatile paddy in spa produced by ordinary street regulation? 3,3,7

The most common and most likely answer to this crossword clue is the 3 plus 3 plus 7 letter word PAY AND DISPLAY

P
A
Y
A
N
D
D
I
S
P
L
A
Y

Buddy explains!

The straight part
We know that "street regulation" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case street regulation = pay and display.
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.

Crossword Answer definitions

PAY AND DISPLAY adjective
  1. Describing a car park in which the motorist obtains a ticket (for a specified period) from a coin-operated machine and displays it in the car so it can be checked by a parking attendant.

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