The most common and most likely answer to this crossword clue is the 7 letter word ABILITY
I've seen this crossword clue in The Daily Telegraph
A
B
I
L
I
T
Y
Buddy explains!

The straight part
We know that "Skill" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case skill = ability.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 ABILITY mean?
ABILITY noun- Suitableness.
- The quality or state of being able; capacity to do or of doing something; having the necessary power.
- The legal wherewithal to act.
- Physical power.
- Financial ability.
- A unique power of the mind; a faculty.
- A skill or competence in doing; mental power; talent; aptitude.