Transport lobby called out (4)
I believe the answer is:
haul
'transport' is the definition.
(I know that haul is a type of transport)
'lobby called out' is the wordplay.
'lobby' becomes 'hall' (synonyms).
'called out' indicates a 'sounds like' (homophone) clue.
'hall' sounds like 'HAUL'.
(Other definitions for haul that I've seen before include "Yank" , "Quantity stolen in a robbery" , "Drag along behind" , "Draw slowly or heavily" , "Drag; loot" .)