Nil (4)
'nil' is the definition.
(I know that nil can be written as nothing)
This is all the clue.
(Other definitions for nothing that I've seen before include "what House of Peers did particularly well?" , "Nought; of no value" , "Zilch, nada" , "Unimportant item" , "unimportant or > unintelligible" .)
'nil' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for none that I've seen before include "Nobody - nothing" , "Not a single person" , "Not one thing" , "Not any sort of neon" , "Not even one" .)
'nil' is the definition.
(I know that nil can be written as zero)
This is the entire clue.
(Other definitions for zero that I've seen before include "Nothing - Japanese aircraft" , "You'll find nothing" , "Cipher for nothing" , "Lowest point" , "Nil, nothing" .)