The most common and most likely answer to this crossword clue is the 3 plus 5 letter word BAR CHART
I've seen this crossword clue in The Times
B
A
R
C
H
A
R
T
More clues leading to the result BAR CHART
- Noble bringing in woman who’ll do diagram
- Graph of British catarrh needing amendment
- Check daily temperature graph
- On which a pub’s sales might be aptly plotted?
- Graphical representation of pub talk? That’s about right
- It shows comparative amounts of bass and troutlike fish caught by trickery
- Homer’s issue about cleaner illustration of comparative values
- Diagram showing local top ten?
- Graphic presentation of pub rules Queen doesn’t support
- Diagram produced by graduate of building design with skill
Buddy explains!
The straight part
We know that "diagram" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case diagram = bar chart.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.