### Clue: Cosseting number one son, delicate duffer nursing broken leg (4-10)
### Answer: SELF-INDULGENCE 
 ### Explanation: Definition: Cosseting number one
 S(abbrev. for "son") + ELFIN(of a person or face, small and delicate) + DUNCE(a duffer;a dimwit) **containing**(nursing) **anagram of**(broken) LEG.
Defn: Cossetting(spoiling) number one(reference to oneself).