### Clue: Embarrassed humble character is protected by mum (8)
### Answer: SHEEPISH 
 ### Explanation: Definition: Embarrassed
  [HEEP(Uriah, the character in Dickens's David Copperfield, one noted for his cloying humility, toadying and insincerity, and making frequent references to his humbleness) + IS] **contained in**(protected by) SH!(imperative to hush,be quiet,keep mum).