The most common and most likely answer to this crossword clue is the 6 letter word BASICS
I've seen this crossword clue in The Daily Telegraph
B
A
S
I
C
S
More clues leading to the result BASICS
- Strike-breaker is imprisoned for raising principles
- Graduates in charge point to brass tacks
- Groundwork used to catch fish — about a ton
- What is another way of expressing this? ABC is
- Thus arts graduates must comprehend what youngsters should be taught
- Fundamentals, thus, grasped by degrees
- Essentials for graduates thus employed
- Nuts and bolts loose in briefcases? Repaired free abroad
- Simple facts coming from arts graduates in charge of science initially!
- Simple stuff, as in cheap pens
Buddy explains!

The straight part
We know that "Essentials" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case essentials = basics.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 BASICS mean?
BASICS noun- A necessary commodity, a staple requirement.
- An elementary building block, e.g. a fundamental piece of knowledge.
- Basic training.