i'd go to la porte de vanves instead.. i've been to clignancourt several times without any luck (but many times lost somewhere outside la périférique without knowing how to get back to where i came from ).. porte de vanves is open every weekend from 7am until the afternoon.. it's in the 14th and you can get there with metro #13 (south bound) or the tramway T3 (or velib' of course )..
hope you have a blast in paris!
hope you have a blast in paris!