### Clue: No mixer – learner, individual needing smooth progress on way up (4,4)
### Answer: LONE WOLF 
 ### Explanation: Definition: No mixer
 L(letter associated with, and displayed by, a learner driver) + ONE(an individual/a singular person) **plus**(needing) **reversal of**(… up, in a down clue) FLOW(smooth progress on way/a continuous and steady streaming along).