Clavicular's beefed-up security detail got a workout in South Florida ... getting into a massive brawl with a group of college kids at a Fort Lauderdale bar.

Sources with direct knowledge tell TMZ ... the clash erupted after people once again brought up claims Peter Thiel gives Clav money -- something we're told gets under his skin because, according to our sources, it isn't true.

We're told Clav himself never touched the guy ... but his security definitely got involved once things went sideways.

Clav's been making the rounds on a college tour lately ... and judging by this stop, campus life is getting a little rowdy.

Video from the scene shows the bar packed before the confrontation erupts ... with several people trading blows in the middle of the crowd.

Despite the chaos ... we're told nobody was arrested.

Cops tell TMZ they have no incident report involving Clavicular at the address ... and no record of a call for service tied to him there.

As we reported, Clav recently beefed up his security after he was slammed to the ground and choked during a separate confrontation in Miami.

Looks like the security-maxxing came in handy.