The most common and most likely answer to this crossword clue is the 7 letter word INSIGHT
I've seen this crossword clue in The Guardian
I
N
S
I
G
H
T
More clues leading to the result INSIGHT
- Complex things outside one’s understanding
- Perception, in a sense
- Understanding current things differently
- Sound of egg on penetration
- I head for Satan in dark vision
- Understanding paper conservationists import pine
- Discernment one Saint displayed in hours of darkness
- Understanding son during brief stay at hotel?
- . Practical knowledge of popular spectacle
- Encourage to use ears for special understanding
Buddy explains!

The straight part
We know that "special understanding" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case special understanding = insight.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 INSIGHT mean?
INSIGHT noun- A sight or view of the interior of anything; a deep inspection or view; introspection; frequently used with into.
- Power of acute observation and deduction
- Knowledge (usually derived from consumer understanding) that a company applies in order to make a product or brand perform better and be more appealing to customers
- Intuitive apprehension of the inner nature of a thing or things; intuition.
- An extended understanding of a subject resulting from identification of relationships and behaviors within a model, context, or scenario.
- An individual's awareness of the nature and severity of one's mental illness.