The most common and most likely answer to this crossword clue is the 7 letter word CAPTCHA
I've seen this crossword clue in The Times
C
A
P
T
C
H
A
More clues leading to the result CAPTCHA
- E-security feature about to get a new patch
- Suitable leaders of children’s holiday activities go after Conservative – it proves humanity
- Captain and chief briefly advanced security protocol
- Letters you see to be typed, for example S-K-I-P T-E-A
- Top, non-European technology linked to advanced verification program
- Captain shortly takes tea in test for robots
- Page in contract on a security system
Buddy explains!
The straight part
We know that "E-security feature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case e-security feature = captcha.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 CAPTCHA mean?
CAPTCHA noun- A computerized test requiring the human user to perform a task deemed to be difficult to automate, such as entering a displayed series of distorted characters or describing images, to demonstrate that he/she is a human and not a computer program.