### Clue: Cleaner's quiet constitutional? (7)
### Answer: SHAMPOO 
 ### Explanation: Definition: Cleaner
 SH!(an interjection requesting quiet) + [A.M. POO](what you might call a morning bowel movement, euphemised as a "morning constitutional").
Interestingly, this sense of the phrase is derived from the original "constitutional" (a walk that is good for your health), in times past when you had to literally walk to the outhouse toilet to do something good for your constitution.