One of TV's "Friends" (6)
'one of tv's friends' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ross that I've seen before include "Diana - (Supremes)" , "Jonathan - - (TV)" , "Macbeth nobleman; Antarctic sea" , "-- Dependency; -- Sea" , "-- And Cromarty, former county of Scotland" .)
(Other definitions for rachel that I've seen before include "Heal RC of the girl" , "Second wife of Jacob" , "Female" , "Woman" , "Import illicitly" .)
(Other definitions for phoebe that I've seen before include "Greek goddess, daughter of Uranus" , "girl" , "Titan, daughter of Uranus -- satellite of Saturn" , "Daughter of Uranus and Gaia" , "Apollo's sister Artemis, the moon goddess" .)
(Other definitions for monica that I've seen before include "Nice silky woman (anag) -- White House intern" , "Girl's name (sounds like name)" , "Girl's name; am icon (anag.)" , "Womans name" , "Girl" .)