It can transport a large number (4)
I believe the answer is:
raft
I believe this is a double definition.
'it can transport' is the first definition.
(I know this)
'a large number' is the second definition.
(I've seen this in another clue)
(Other definitions for raft that I've seen before include "large collection" , "Vehicle" , "Primitive boat" , "great deal" , "Flat, floating platform" .)