The most common and most likely answer to this crossword clue is the 7 letter word BRIDLED
I've seen this crossword clue in The Times
B
R
I
D
L
E
D
More clues leading to the result BRIDLED
Buddy explains!

The straight part
We know that "Checked" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case checked = bridled.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 BRIDLED mean?
BRIDLED verb- To put a bridle on.
- To check, restrain, or control with, or as if with, a bridle; as in bridle your tongue.
- To show hostility or resentment.
- To hold up one's head proudly or affectedly.
- Equipped with a bridle; controlled.
- Having bridle-shaped marks.