Company's emblem, record and disc (4)
I believe the answer is:
Here is my best explanation:
'company's emblem' is the definition.
(I've seen this before)
'record and disc' is the subsidiary indication.
'record' becomes 'log' (log is a kind of record).
'and' means one lot of letters go next to another.
'disc' becomes 'o'.
(Other definitions for logo that I've seen before include "A firm's sign or symbol", "Symbolic design", "Small emblem or device", "(Company) symbol", "(Company) design", "Symbol or emblem used by organisation", "organisational symbol", "Vigour; relish", "Printed symbol as organisation's emblem" and "Trademark".)