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Help with the following would be appreciated

With this one can sail inland but not at sea
R?V?R??R?H????? (15).
Unwanted state interference
???A?I?N (8)
So one's repeatedly returning from a place in Italy
?????L (6)

Many thanks

1. Riverworthiness - ie to be used inland, not at seas.

Unwanted state interference
INVASION?

Thanks both.
I had invasion but like you I had a question mark over it.
The final clue has one more letter now if that helps

So one's repeatedly returning from a place in Italy.
?S????L
the fourth letter could be "I" (I for India, phonetically)