On the first time since the last parking in 3rd gear switch noticeable clacking/clicking in the accelerator pedal

A hello to all I have also my little flicker since March. I still find that I have the greatest car, but I have a problem there. When I start my Clio and start driving, I almost always have a quiet but in the accelerator pedal noticeable clacking/clicking when I first switch into the third gear… Only once and then it only comes back when I have put it off. (showing usually does not work, since he behaves ^^) I have already described this once in the workshop And there they have exchanged some ungreased seals on the axles. But it still clacks anyway. Does anyone else have that? What can that be? I just don’t know how I can describe it to the workshop, because I can’t demonstrate it? I would be grateful for help LG Anne PS: Shut your side windows even if they are half open?