Cryptic crossword clue
Good Scots side sets standard 6

The most common and most likely answer to this crossword clue is the 6 letter word GUIDON

I've seen this crossword clue in The Times
G
U
I
D
O
N

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 = guidon.
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 GUIDON mean?

GUIDON noun
  1. A small pennant or banner carried by infantry soldiers to direct troop movement.
  2. A soldier assigned to carry such a banner.

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