The most common and most likely answer to this crossword clue is the 8 letter word RAILCARD
R
A
I
L
C
A
R
D
Buddy explains!
The straight part
We know that "Fare-reducing British pass" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case fare-reducing british pass = railcard.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.
What does RAILCARD mean?
RAILCARD noun- A card allowing reduced fares for travelling by train.