Nothing on record that identifies business (4)
I believe the answer is:
logo
'nothing on record that identifies business' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'nothing on record' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'on' says to put letters next to each other.
'record' becomes 'log' (logging is a kind of recording).
'o' after 'log' is 'LOGO'.
Can you help me to learn more?
(Other definitions for logo that I've seen before include "A company's printed symbol or emblem" , "Small design used as a company emblem" , "(Company) symbol" , "Vigour; relish" , "Printed symbol as organisation's emblem" .)