We object to point of employment (3)
I believe the answer is:
use
'employment' is the definition.
(how something is used)
'we object to point' is the wordplay.
'we object' becomes 'us' (object pronoun for 'we').
'to point' becomes 'e' (compass point).
'us'+'e'='USE'
'of' acts as a link.
(Other definitions for use that I've seen before include "Employ, put into service" , "Exploit unfairly" , "consume; exploit" , "Benefit" , "Expend in amusement" .)