Band blew their own trumpets? (4)
I believe the answer is:
crew
'band' is the definition.
(I've seen this before)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for crew that I've seen before include "Squad" , "Train team" , "A ship's workers" , "Made early call" , "Those who man a ship or aircraft" .)