The most common and most likely answer to this crossword clue is the 6 letter word INFORM
I
N
F
O
R
M
More clues leading to the result INFORM
- Sneak attending class?
- Put wise students here?
- Be a tell-tale in class
- Playing well at the moment, do some singing?
- . Grass due to receive a bit of manure
- Tell why one is playing well
- . Spill the beans – many pupils have not been here much this year!
- Wearing fashion to shop
- Tell man from Belfast to stand?
- Grass is doing well
Buddy explains!

The straight part
We know that "Be a tell-tale" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case be a tell-tale = inform.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 INFORM mean?
INFORM verb- To instruct, train (usually in matters of knowledge).
- To communicate knowledge to.
- To impart information or knowledge.
- To act as an informer; denounce.
- To give form or character to; to inspire (with a given quality); to affect, influence (with a pervading principle, idea etc.).
- To make known, wisely and/or knowledgeably.
- To direct, guide.
- To take form; to become visible or manifest; to appear.
- Without regular form; shapeless; ugly; deformed.