Get a vocal group that's heard (7)
I believe the answer is:
acquire
'get' is the definition.
(I know that get can be written as acquire)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for acquire that I've seen before include "Gain, obtain" , "Come into possession of" , "Come to possess" , "Get" , "Bag" .)