Squad rejoiced (4)
I believe the answer is:
crew
'squad' is the definition.
(I know that crew is a type of squad)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for crew that I've seen before include "Sailor complement of ship" , "Ship's operators" , "Very short haircut for the ship's complement" , "clapped themselves?" , "Ship's men" .)