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 an anagram.
'tonne' anagrammed gives 'NONET'.
'by' acts as a 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" .)