...corporate ID account for insider (4)
I believe the answer is:
logo
'corporate id' is the definition.
(I've seen this in another clue)
'account for insider' is the wordplay.
'account' becomes 'log' (I've seen this in another clue).
'for insider' becomes 'o' (I am not sure about this - if you are sure you should believe this answer much more).
'log'+'o'='LOGO'
Can you help me to learn more?
(Other definitions for logo that I've seen before include "Small emblem or device" , "organisational symbol" , "Symbolic design" , "Small design used as a company emblem" , "Company emblem or device" .)