What concert performers do their stuff in? (6)
I believe the answer is:
unison
This might be a double definition.
'what concert performers do their' is the first definition.
The definition suggests a singular noun which matches the answer.
'stuff in?' is the second definition.
The definition and answer can be both human attributes as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
Can you help me to learn more?
(Other definitions for unison that I've seen before include "Togetherness - TUC member" , "Complete agreement, harmony" , "In agreement - like sound of choir" , "All singing the same note" , "As one, singers perhaps" .)