Cryptic crossword clue
Rails over very long time cycle 5

The most common and most likely answer to this crossword clue is the 5 letter word SAROS

S
A
R
O
S

Buddy explains!

The straight part
We know that "very long time cycle" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case very long time cycle = saros.
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 SAROS mean?

SAROS noun
  1. (history, Babylon) A quantity of 3600, such as a period of 3600 years.
  2. A period of 223 synodic months (approximately 18 years 11 days 8 hours), after which the relative positions of the earth, sun and moon recur, used to predict eclipses.

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