Former senior police woman detective (4)
I believe the answer is:
dick
This could be a double definition.
'former senior police woman' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'detective' is the second definition.
(informal term for a detective)
Can you help me to learn more?
(Other definitions for dick that I've seen before include "See 20 Across" , "'Moby --'" , "-- Van Dyke, actor" , "See 9 Across" , "may be spotted eating" .)