### Clue: Leading character in Iliad (likewise in our translation, additionally?) (4)
### Answer: IOTA 
 ### Explanation: Definition: Leading character in Iliad
First letters ('likewise' – ie first characters) of '**I**n **O**ur **T**ranslation **A**dditionally'. The definition refers to the first Greek character in the word 'Iliad', not the text.