The most common and most likely answer to this crossword clue is the 6 letter word DENOTE
I've seen this crossword clue in The Daily Telegraph
D
E
N
O
T
E
More clues leading to the result DENOTE
- Balls up public school upbringing? That’s mean!
- Stand for leader of England with muscular back
- Mean to silence a musician?
- Show public school journalist around
- Study suppressing on-target earnings is mean
- Indicate no time that river flows over
- Parade not exactly holding show
- Mean word used to express denial in letter
- Indicate odd edge to letter
- Suggest book to study first before entrance exam
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 = denote.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 DENOTE mean?
DENOTE verb- To indicate; to mark.
- To make overt.
- To refer to literally; to convey as meaning.