A dominant second-half display from Clermont Auvergne helped them beat Scarlets in the Heineken Cup for the second time in seven days.
Gareth Maule helped the home side head into half time with a narrow lead, with Rhys Priestland having also added two penalties for Scarlets.
However, the Welsh club were prevented from adding to their score after the break, while the visitors scored three tries, including a second of the afternoon for Napolioni Nalaga.
Brock James managed to convert all three second-half penalties, but struggled with a couple of penalty efforts earlier in the half due to the high winds in Llanelli.
The result leaves Clermont eight points clear at the top of pool four, while Scarlets remain third.