Clark represented Team GB at the 2008 Olympics in Beijing
Scotland duo James Millar and Sarah Clark have picked up bronze medals at their respective World Cup events.
A yuko for under-60kg fighter Millar was the only score of the contest as he beat Finland's Valtteri Jokinen to finish third in Talinn, Estonia
"I've been out with a knee injury so this is a great confidence boost with the World Championships just round the corner," said Millar.
Meanwhile, Clark beat Ekaterina Valkova in the under-63kg division in Lisbon.
Clark, who like Millar trains at the Judo Scotland's national training centre in Edinburgh, won three of her four fights - only losing to Croatia's Marijana Miskovic in the semi-final.
And she registered a yuko and an ippon to win the bronze medal contest.
Sarah Adlington finished fifth in the over-78kg category at the Portugal event, while Faith Pitman was also fifth in the under-63kg field.
Back in Estonia, Chris Sherrington and Danny Williams finished seventh in the over 100kg and under 73kg categories.
The 2011 World Championships are held in France in August.