### Clue: It's worn by fitter after going out (6)
### Answer: TITFER 
 ### Explanation: Definition: It's worn by fitter after going out
  Anagram(*after going out*) of *FITTER*.
Defn:  Cockney rhyming slang for "hat", "tit for tat" shortened to "titfer".  Another excellent wordplay intertwined with definition, though I thought that "after" is superfluous, and its deletion would have made for an even more excellent clue.