Opprobrious thing to do (3)
I believe the answer is:
rob
'do' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.
'opprobrious thing' is the wordplay.
'ROB' is hidden within the letters.
However, I am not sure how this is indicated.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for rob that I've seen before include "Unlawfully take property from (someone)" , "Nick" , "Thieve" , "Burgle" , "shortened form of man's name" .)