The most common and most likely answer to this crossword clue is the 7 letter word BETOKEN
B
E
T
O
K
E
N
More clues leading to the result BETOKEN
Buddy explains!

The straight part
We know that "Show" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case show = betoken.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 BETOKEN mean?
BETOKEN verb- To signify by some visible object; show by signs or tokens.
- To foreshow by present signs; indicate something future by that which is seen or known.