Sorry guys, have been working the whole day so couldn't get back to you. Thank you for trying so far, I'm glad I found u!
So, just to sum up the clue was "Stop!", it was 4 letters and I had the second (H) and the fourth (A). I have no reason to doubt about both as they perfectly matched other clues.
Joker, your four hints sounded great, but do not match that _H_A pattern I had!!