The most common and most likely answer to this crossword clue is the 8 letter word CONTAINS
I've seen this crossword clue in The Daily Telegraph
C
O
N
T
A
I
N
S
More clues leading to the result CONTAINS
Buddy explains!
The straight part
We know that "Checks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case checks = contains.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 CONTAINS mean?
CONTAINS verb- To hold inside.
- To include as a part.
- To put constraint upon; to restrain; to confine; to keep within bounds.
- (of a set etc.) To have as an element or subset.
- To restrain desire; to live in continence or chastity.