The most common and most likely answer to this crossword clue is the 5 letter word BLINK
I've seen this crossword clue in Independent
B
L
I
N
K
More clues leading to the result BLINK
Buddy explains!
The straight part
We know that "You might miss fast train because of this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case you might miss fast train because of this = blink.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 BLINK mean?
BLINK noun- The act of very quickly closing both eyes and opening them again.
- The time needed to close and reopen one's eyes.
- A text formatting feature that causes text to disappear and reappear as a form of visual emphasis.
- A glimpse or glance.
- Gleam; glimmer; sparkle
- The dazzling whiteness about the horizon caused by the reflection of light from fields of ice at sea; iceblink
- (in the plural) Boughs cast where deer are to pass, in order to turn or check them.
- An ability that allows teleporting, mostly for short distances
- To close and reopen both eyes quickly.
- To flash on and off at regular intervals.
- To perform the smallest action that could solicit a response.
- To shut out of sight; to evade; to shirk.
- To trick; to deceive.
- To turn slightly sour, or blinky, as beer, milk, etc.
- To teleport, mostly for short distances.