Intermittent clutch problem

[Bluesy]

Hi all,
Newbie here. I've looked all over the place to find a solution for my clutch problem.
I live in the countryside in the north of the Netherlands. When I drive locally in my 2007, 1.2 petrol, manual Yaris (2) it seems to drive perfectly. There are very few stoplights and literally no traffic jams. But when I drive to the provincial capital some 40 km away, things start to change. If I get into some stop/start traffic there or especially a series of stoplights. The clutch begins to act up, it begins to get very jerky on the take up. Its as if I can't let the pedal up slowly enough for it to drive away smoothly, I have to keep dipping it again and play around with the gas pedal to get away from the lights at all.
Who can help me fix this Jekyll and Hyde Yaris.
Thanks in advance

Bluesy