Cryptic crossword clue
Sabbath guitarist’s mate hasn’t left band 8

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

I've seen this crossword clue in Independent
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Buddy explains!

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

SPECTRUM noun
  1. A range; a continuous, infinite, one-dimensional set, possibly bounded by extremes.
  2. Specifically, a range of colours representing light (electromagnetic radiation) of contiguous frequencies; hence electromagnetic spectrum, visible spectrum, ultraviolet spectrum, etc.
  3. The autism spectrum.
  4. The pattern of absorption or emission of radiation produced by a substance when subjected to energy (radiation, heat, electricity, etc.).
  5. The set of eigenvalues of a matrix.
  6. Of a bounded linear operator A, the set of scalar values λ such that the operator A—λI, where I denotes the identity operator, does not have a bounded inverse; intended as a generalisation of the linear algebra sense.
  7. (abstract algebra) The set, denoted Spec(R), of all prime ideals of a given ring R, commonly augmented with a Zariski topology and considered as a topological space.
  8. Specter, apparition.
  9. The image of something seen that persists after the eyes are closed.

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