The bulk update request #7741 is pending approval.

create implication chobits (6) -> clamp_(manga) (0)
create implication magic_knight_rayearth (13) -> clamp_(manga) (0)
create implication cardcaptor_sakura (246) -> clamp_(manga) (0)
create implication angelic_layer (1) -> clamp_(manga) (0)
create alias tsubasa_chronicles (2) -> tsubasa:_reservoir_chronicle (0)
create implication tsubasa:_reservoir_chronicle (0) -> clamp_(manga) (0)
create implication xxxholic (1) -> clamp_(manga) (0)
create implication kobato (41) -> clamp_(manga) (0)

Reason: All of these manga series were created by the group Clamp, which frequently does crossovers between their series, so I think it makes sense to group them under an umbrella tag.

https://en.wikipedia.org/wiki/Clamp_(manga_artists)

Various series by the group cross-reference each other, and characters reappear in multiple works by the group, with Tsubasa, a series set across multiple dimensions, featuring multiple alternative versions of characters from past works.

There's already one_(manga), so it's not unprecedented. I'm not really a fan of *_(manga) in this case, though, so if anyone has any other suggestions...