Cryptic crossword clue
Number at filling station reacting to an upset 6,6

The most common and most likely answer to this crossword clue is the 6 plus 6 letter word OCTANE RATING

I've seen this crossword clue in The Times
O
C
T
A
N
E
R
A
T
I
N
G

Buddy explains!

The straight part
We know that "Number at filling station" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case number at filling station = octane rating.
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.

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