Also comes to nothing (3)
I believe the answer is:
too
'also' is the definition.
('too' can be a synonym of 'also')
'to nothing' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'to'+'o'='TOO'
'comes' is the link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for too that I've seen before include "What a pity!" , "Also; overly" , "Likewise" , "Moreover, in addition" , "Unduly" .)