Clue: South African (half-cut) visits Sark etc, receiving cheers (also half-cut) for vegetable (8)
Answer: ZUCCHINI
Explanation: Definition: vegetable
**ZU**[LU]="South African (half-cut)"; plus **CI** (Channel Islands)="Sark etc" around **CHIN**-[chin]=a toast="cheers (also half-cut)"