The most common and most likely answer to this crossword clue is the 4 letter word KNOW
I've seen this crossword clue in Financial Times
K
N
O
W
More clues leading to the result KNOW
- One unlikely to pass legislation on filling empty landmark up
- Understand speaker's refusal
- Distinguish why, occasionally, North Korea's leaders looking to the West
- Recognise obsessive specialist from the east
- Rise to embrace comedian, a wise guy
- Be aware, I refuse to be heard
- Recognise man immediately
- Recognise a refusal when you hear it
- Understand studious person is heading west
- Understand refusal to hear?
Buddy explains!

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 KNOW mean?
KNOW noun- Knowledge; the state of knowing.
- To perceive the truth or factuality of; to be certain of or that.
- To be aware of; to be cognizant of.
- To be acquainted or familiar with; to have encountered.
- To experience.
- To be able to distinguish, to discern, particularly by contrast or comparison; to recognize the nature of.
- To recognize as the same (as someone or something previously encountered) after an absence or change.
- To understand or have a grasp of through experience or study.
- To have sexual relations with. This meaning normally specified in modern English as e.g. to ’know someone in the biblical sense’ or to ‘know Biblically.’
- To have knowledge; to have information, be informed.
- To be or become aware or cognizant.
- To be acquainted (with another person).
- To be able to play or perform (a song or other piece of music).