The most common and most likely answer to this crossword clue is the 7 letter word ROADIES
I've seen this crossword clue in The Guardian
R
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More clues leading to the result ROADIES
Buddy explains!

The straight part
We know that "Band’s crew" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case band’s crew = roadies.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 ROADIES mean?
ROADIES noun- A biker.
- One of the crew for a musical group or other travelling stage production, especially a stagehand or technician.
- An alcoholic beverage for the ride, for consumption while one is driving.