Admirers of an American sitcom (7)
I believe the answer is:
friends
I believe this is a double definition.
'admirers' is the first definition.
(I know this)
'an american sitcom' is the second definition.
(I've seen this before)
'of' is the link.
(Other definitions for friends that I've seen before include "Pals, comrades" , "''..., Romans, countrymen, lend me your ears'' (Julius Caesar)" , "American sitcom" , "Chums" , "Intimates" .)