### Clue: She does work in the Met briefly (4)
### Answer: MOPP 
 ### Explanation: Definition: She does
OP ("work") in MP (Metropolitan Police, so "Met, briefly") 
*Mrs Mopp is a term for a cleaner or a "woman who does".*
 
*I suppose these days it should be "one does", although I've never heard of a Mr Mopp (yet!)