Cryptic crossword clue
Possibly an electrified train, not having run off the rails, getting in earlier 10,7

The most common and most likely answer to this crossword clue is the 10 plus 7 letter word INDEFINITE ARTICLE

I've seen this crossword clue in Independent
I
N
D
E
F
I
N
I
T
E
A
R
T
I
C
L
E

Buddy explains!

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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