### Clue: Barmy notice that may be 17? (6,5)
### Answer: CUCKOO CLOCK 
 ### Explanation: Definition: that may be 17
  CUCKOO(barmy,crazy) + CLOCK(British slang for "to see" or "to notice")
Defn: As Harry Lime (Orson Welles) said: "In Switzerland they had brotherly love – they had 500 years of democracy and peace, and what did that produce? The cuckoo clock."