The end is nothing great (5)
I believe the answer is:
omega
'the end' is the definition.
(thesaurus)
'nothing great' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'great' becomes 'mega' (I've seen this before).
'o'+'mega'='OMEGA'
'is' is the link.
(Other definitions for omega that I've seen before include "long letter" , "Consummation" , "Final Greek letter" , "Final outcome" , "Last letter of the Greek alphabet" .)