To be a bad cop is difficult, duck (7)
I believe the answer is:
pochard
'duck' is the definition.
(I know that pochard is a type of duck)
'to be a bad cop is difficult' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
an anagram of 'cop' is 'poc' which is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for pochard that I've seen before include "diver" , "Type of diving duck" , "Spanish wine" , "bird" .)