The most common and most likely answer to this crossword clue is the 6 letter word SMITHS
I've seen this crossword clue in Independent
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M
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Buddy explains!

The straight part
We know that "Band/forgers" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case band/forgers = smiths.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 SMITHS mean?
SMITHS noun- A craftsperson who works metal into desired forms using a hammer and other tools, sometimes heating the metal to make it more workable, especially a blacksmith.
- (by extension) One who makes anything; wright.
- An artist.
- To forge, to form, usually on an anvil; by heating and pounding.