Class for Bond's boss (4)
I believe the answer is:
form
'class' is the definition.
(I know that class can be written as form)
'for bond's boss' is the wordplay.
'bond's boss' becomes 'm' (M is the head of MI6 in the James Bond series).
'for'+'m'='FORM'
(Other definitions for form that I've seen before include "Visible shape, class" , "A hare's hide-out" , "Printed document with blank spaces for information to be inserted" , "Group of schoolchildren < > construct" , "Seat" .)