Providing a service, of course, for travellers in Venice, foreign waiter welcomes Levi loudly (5,4)
I believe the answer is:
water taxi
'providing a service of course for travellers in venice' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'foreign waiter welcomes levi loudly' is the wordplay.
'foreign' indicates anagramming the letters (foreign order of the letters).
'welcomes' means one lot of letters goes inside another (in sense of 'invites in').
'levi loudly' becomes 'tax' (I can't justify this - if you can you should give a lot more credence to this answer).
'waiter' with letters rearranged gives 'wateri'.
'wateri' placed around 'tax' is 'WATER TAXI'.
Can you help me to learn more?
(Another definition for water taxi that I've seen is " vessel".)