### Clue: Antagonise a learner – that is needless primarily, battle regularly lost (8)
### Answer: ALIENATE 
 ### Explanation: Definition: Antagonise
 A + L(letter displayed by a learner driver) + IE(abbrev. for "id est"/that is) + **1st letter of**(… primarily) "needless" + "battle" **minus ****its 1st, 3rd and 5th letters**(regularly lost).