The most common and most likely answer to this crossword clue is the 10 letter word SCRUTINISE
I've seen this crossword clue in The Times
S
C
R
U
T
I
N
I
S
E
More clues leading to the result SCRUTINISE
- Study cites ruins in Byzantine state
- Examine clubs in ruined sites journalist’s avoided after bombing
- Examine small metal container during voyage at sea
- Look at nicer suits in a new style
- Check money put into second trip on board
- Examine container carried aboard Sweden pleasure trip
- Study sun’s element in pleasure trip
- Examine closely tailoring of nicer suits
- . Inspect top of ship’s sail pierced by metal
- Check small container during voyage
Buddy explains!

The straight part
We know that "Check" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case check = scrutinise.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 SCRUTINISE mean?
SCRUTINISE verb- To examine something with great care.
- To audit accounts etc in order to verify them.