Box Snoop's debut rap collection (4)
I believe the answer is:
spar
'box' is the definition.
(sparring is a kind of boxing)
'snoop's debut rap collection' is the wordplay.
'debut' says to take the initial letters.
'collection' indicates anagramming the letters (the same collection of letters).
The initial letter of 'snoops' is 's'.
'rap' is an anagram of 'par'.
's'+'par'='SPAR'
(Other definitions for spar that I've seen before include "Mineral; strong pole" , "Box without punching hard" , "Shadow box" , "Scrap" , "Raps with large beam" .)