Cryptic crossword clue
Stone ras erected showing calendar differences 6

The most common and most likely answer to this crossword clue is the 6 letter word EPACTS

E
P
A
C
T
S

Buddy explains!

The straight part
We know that "calendar differences" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case calendar differences = epacts.
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 EPACTS mean?

EPACTS noun
  1. The time (number of days) by which a solar year exceeds twelve lunar months; it is used in the calculation of the date of Easter

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