The most common and most likely answer to this crossword clue is the 6 letter word TAUGHT
I've seen this crossword clue in The Guardian
T
A
U
G
H
T
More clues leading to the result TAUGHT
- Instructed in pronunciation of tense
- Gave lessons, in time, on anything at all
- Did school put rubbish outside that’s foul?
- Reported to be stretched tight, as instructed
- Instructed to express disgust when surrounded by rubbish
- Enlightened, thanks to reformed thug
- Was coach tense on the radio?
- Worked in school experiencing stress that’s pronounced
- Gave lesson for ‘tense’ aloud
- As a pupil ‘tensed up’ according to report
Buddy explains!

The straight part
We know that "instructed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case instructed = taught.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 TAUGHT mean?
TAUGHT verb- To show (someone) the way; to guide, conduct; to point, indicate.
- (ditransitive) To pass on knowledge to.
- To pass on knowledge, especially as one's profession; to act as a teacher.
- (ditransitive) To cause to learn or understand.
- (ditransitive) To cause to know the disagreeable consequences of some action.