Cryptic crossword clue
A rainbow could be one, being a band of seven 8

The most common and most likely answer to this crossword clue is the 8 letter word SEPTETTE

S
E
P
T
E
T
T
E

Buddy explains!

The straight part
We know that "band of seven" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case band of seven = septette.
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 SEPTETTE mean?

SEPTETTE noun
  1. A set of seven persons or objects.
  2. A musical composition for seven instruments or seven voices; a septuor.

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