Crossword Puzzle Round units

Clue: Round units

Sing in a round (TROLL with 5 letters)
Yacht units (KNOTS with 5 letters)
Oil units (BARRELS with 7 letters)
Hay and cotton units (BALES with 5 letters)
Roundabout path (DETOUR with 6 letters)
Small, round sponge cake topped with fruit and whipped cream (MARYJANE with 8 letters)
Some metric units of length (HECTOMETERS with 11 letters)
Round-skipping advantages (BYES with 4 letters)
They're rounded up in a roundup (STEERS with 6 letters)
Quick round of tennis? (ONESET with 6 letters)