一派 is read as いっぱ (ippa) and means school.
いっぱ
ippa
いっとういっぱ
particular party or faction
ほういつは
Sakai Houitsu school
いちおう
just in case
いっしょうけんめい
very hard
いっち
union
いっしゅん
instant
ひとにぎり
handful
いちがいに
unconditionally
いっぽんずり
fishing with a pole
いっき
one tree
いちげき
blow
いっとう
single stroke