Unique and special online coverage of retro music genre (9)
I believe the answer is:
nonpareil
'unique' is the definition.
(I've seen this before)
'special online coverage of retro music genre' is the wordplay.
'special' indicates an anagram.
'coverage of' means one lot of letters goes inside another.
'retro' shows that the letters should be reversed in order (retro is Latin for 'backwards').
'music genre' becomes 'rap' (rap is a music genre).
'rap' backwards is 'par'.
'online' anagrammed gives 'noneil'.
'noneil' placed around 'par' is 'NONPAREIL'.
'and' acts as a link.
(Other definitions for nonpareil that I've seen before include "Without equal, unrivalled" , "ideal" , "without peers" , "Eminent beyond comparison" , "Iron panel (anag.)" .)