The most common and most likely answer to this crossword clue is the 3 plus 5 plus 3 plus 4 letter word RED WHITE AND BLUE
I've seen this crossword clue in The Guardian
R
E
D
W
H
I
T
E
A
N
D
B
L
U
E
More clues leading to the result RED WHITE AND BLUE
Buddy explains!
The straight part
We know that "Standard" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case standard = red white and blue.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.