### Clue: Dog collars start to niggle chap with lurid hooter (4)
### Answer: DONG 
 ### Explanation: Definition: chap with lurid hooter
 DOG **containing**(collars) **the 1st letter of**(start to) "niggle ".
Answer: Hold on! Before you go down the path of lurid terms for parts of the anatomy (viz. dongs and hooters), it's a chap with a nose;in slang, a hooter, which was red and lighted: None other than Edward Lear's "The Dong With A Luminous Nose" from his "Laughable Lyrics – A Fourth Book of Nonsense Poems". And it tells a love story, would you believe. Cheeky clue!