The phrase "clear handball" means that during a game, a player intentionally touches or stops the ball with their hand, and it is very obvious to everyone, including the referee, that they broke the rules. Full definition
Again, I'm not complaining Arsenal was definitely the better team, but I'm not kidding myself that was a clear handball. (justarsenal.com)
Barça's increasing desperation only served to play into Atléti's hands, and a clear handball in the penalty area by Andrés Iniesta — who desperately sought to prevent the hosts from going two up on the counter-attack — allowed Griezmann the opportunity to score from the spot. (sbnation.com)
And the third and fourth outstretched leg if done by us or anyone else would be clear handball. (justarsenal.com)