Group transported tonne (5)
I believe the answer is:
nonet
'group' is the definition.
(group of nine musicians)
'transported tonne' is the wordplay.
'transported' is an anagram indicator.
'tonne' with letters rearranged gives 'NONET'.
(Other definitions for nonet that I've seen before include "small band" , "Composition for nine performers" , "Instrumental group of nine players" , "Ennead" , "Composition for nine players" .)