Jorge Sampaoli's 2nd-placed facet had won their last video games to transport four points clean of third-positioned Nice and 5 ahead of fourth-located Strasbourg getting into the weekend.
Nice edged out Angers 1-zero, however Strasbourg were held to a 2-2 draw at Saint-Etienne.
But Marseille exceeded up the opportunity to create a seven-factor buffer to Strasbourg, as goals in both half of from Mohamed Bayo and Jim Allevinah gave Clermont a third win in four league games.
Marseille have now received simply considered one of their final 5 domestic league video games and had been booed off the pitch via their fans.
"It's tough for us here, we have dropped plenty of factors," stated Sampaoli. "We should accurate that and win games at home.
"The whistles are regular. The enthusiasts desired to look what they came for and we could not deliver it to them."
OM had few uncomplicated chances notwithstanding dominating ownership, with Dimitri Payet's shot which became saved via Ouparine Djoco quickly earlier than half of-time the nearest they came to a aim.
Victory could have moved the hosts to within 10 factors of Paris Saint-Germain after the capital giants' 3-1 loss at Nantes on Saturday, however the runaway leaders stay thirteen points clean.
Earlier, Justin Kluivert scored as Nice gained at domestic to Angers.
The Dutch winger's smart end on 19 minutes became his 1/3 goal in as many video games.
