The most common and most likely answer to this crossword clue is the 5 letter word HEARS
H
E
A
R
S
More clues leading to the result HEARS
Buddy explains!

The straight part
We know that "Comes to know of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case comes to know of = hears.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 HEARS mean?
HEARS verb- (stative) To perceive sounds through the ear.
- (stative) To perceive (a sound, or something producing a sound) with the ear, to recognize (something) in an auditory way.
- To exercise this faculty intentionally; to listen to.
- To listen favourably to; to grant (a request etc.).
- To receive information about; to come to learn of.
- (with from) To be contacted by.
- To listen to (a person, case) in a court of law; to try.
- To sympathize with; to understand the feelings or opinion of.