Cryptic crossword clue
Adds different colours to very small sign around entrance 10

The most common and most likely answer to this crossword clue is the 10 letter word VARIEGATES

I've seen this crossword clue in The Daily Telegraph
V
A
R
I
E
G
A
T
E
S

Buddy explains!

The straight part
We know that "Adds different colours" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case adds different colours = variegates.
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 VARIEGATES mean?

VARIEGATES verb
  1. To add variety to something.
  2. To change the appearance of something, especially by covering with patches or streaks of different colour.
  3. To dapple.

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