The most common and most likely answer to this crossword clue is the 8 letter word STANDARD
I've seen this crossword clue in The Daily Telegraph
S
T
A
N
D
A
R
D
Buddy explains!

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 STANDARD mean?
STANDARD noun- A principle or example or measure used for comparison.
- A vertical pole with something at its apex.
- A manual transmission vehicle.
- The upper petal or banner of a papilionaceous corolla.
- An inverted knee timber placed upon the deck instead of beneath it, with its vertical branch turned upward from that which lies horizontally.
- A large drinking cup.
- Standard idiom, a prestigious or standardized language variety; standard language
- Falling within an accepted range of size, amount, power, quality, etc.
- (of a tree or shrub) Growing alone as a free-standing plant; not trained on a post etc.
- Having recognized excellence or authority.
- Of a usable or serviceable grade or quality.
- (of a motor vehicle) Having a manual transmission.
- As normally supplied (not optional).
- Conforming to the standard variety.
- An expression of agreement