Ship less back to the 'not nice' part of Venice (6)
I believe the answer is:
vessel
'ship' is the definition.
(I've seen this before)
'less back to the not nice part of venice' is the wordplay.
'back' says the letters should be written in reverse.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the not nice part of venice' becomes 've' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'less' backwards is 'ssel'.
'ssel' after 've' is 'VESSEL'.
Can you help me to learn more?
(Other definitions for vessel that I've seen before include "Ship, or receptacle for liquid" , "Blood-carrying tube or a ship" , "A ship, a cup" , "Decide on or establish" , "Bark, possibly, needing water" .)