Quakers in old sitcom (7)
I believe the answer is:
friends
This clue might be a double definition.
'quakers' is the first definition.
('Friend' can be a synonym of 'quaker')
'old sitcom' is the second definition.
'friends' can be an answer for 'sitcom' (US sitcom). I am not sure about the 'old' bit.
'in' is the link.
Can you help me to learn more?
(Other definitions for friends that I've seen before include "American sitcom" , "playmates!" , "Chums" , "Intimates" , "Pals, comrades" .)