Redesigned portative water transport (9)
I believe the answer is:
vaporetti
'water transport' is the definition.
Although both the answer and 'transport' are nouns, they are not in the same form of the noun.
'redesigned portative' is the wordplay.
'redesigned' indicates an anagram.
'portative' is an anagram of 'VAPORETTI'.
Can you help me to learn more?
(Other definitions for vaporetti that I've seen before include "Venetian craft" , "Venetian canal boats" , "boats in Venice" .)