Tonne transported by group (5)
I believe the answer is:
nonet
'group' is the definition.
(group of nine musicians)
'tonne transported' is the wordplay.
'transported' indicates anagramming the letters.
'tonne' with letters rearranged gives 'NONET'.
'by' is the link.
(Other definitions for nonet that I've seen before include "Composition for nine performers" , "Band's" , "musical piece" , "Multi-figure composition" , "Piece for nine players" .)