Cryptic crossword clue
Racing foolishly, tense at first but no longer concerned 4,6

The most common and most likely answer to this crossword clue is the 4 plus 6 letter word PAST CARING

I've seen this crossword clue in The Daily Telegraph
P
A
S
T
C
A
R
I
N
G

Buddy explains!

The straight part
We know that "no longer concerned" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case no longer concerned = past caring.
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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