Friends perhaps come on site, having absolutely no English (6)
I believe the answer is:
sitcom
'friends perhaps' is the definition.
(US sitcom 'Friends')
'come on site having absolutely no english' is the wordplay.
'come' becomes 'com' (I am not sure about this - if you are sure you should believe this answer much more).
'on' says to put letters next to each other.
'having absolutely no' is a deletion indicator.
'english' becomes 'e' (abbreviation).
'site' with 'e' taken out is 'sit'.
'com' after 'sit' is 'SITCOM'.
(Other definitions for sitcom that I've seen before include "TV series (colloq.)" , "Episodical TV programme" , "Humorous situation drama, in short" , "Form of TV comedy" , "this could be fun" .)