Which musical groups lack mesh? (6)
I believe the answer is:
nonets
'groups lack mesh?' is the definition.
'nonets' can be an answer for 'groups' (I've seen this before). I'm not sure about the 'lack mesh?' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for nonets that I've seen before include "Group of players" , "Pieces of music for groups of nine" , "Groups of nine musicians" , "Compositions for nine players" , "musical pieces" .)