Horse and cart transported pit workers (9)
I believe the answer is:
orchestra
'pit workers' is the definition.
(people working in the orchestra pit in a theatre)
'horse and cart transported' is the wordplay.
'and' is a charade indicator (letters next to each other).
'transported' is an anagram indicator.
'horse'+'cart'='horsecart'
'horsecart' with letters rearranged gives 'ORCHESTRA'.
(Other definitions for orchestra that I've seen before include "many players" , "Noted performers" , "Gamelan, for instance" , "A number of musicians" , "in four sections" .)