Comfortable playing the visitors (2,4)
I believe the answer is:
at home
'comfortable' is the definition.
(I've seen this before)
'playing the visitors' is the wordplay.
'playing' becomes 'at' (I've seen this in other clues).
'the visitors' becomes 'home' (I can't justify this - if you can you should give a lot more credence to this answer).
'at'+'home'='AT-HOME'
Can you help me to learn more?
(Other definitions for at home that I've seen before include "Where one lives" , "Oh mate! (anag)" , "Reception in one's own abode" , "Familiar with" , "In (for a party?)" .)