### Clue: Little 'un to toddle those first three steps (3)
### Answer: TOT 
 ### Explanation: Definition: Little 'un
  *First three* letters,*steps*(to maintain the surface reading) of *TO Toddle*.
Defn:  *Little* child,*'un*, eg. a toddler, one who is just learning to *toddle*,take his/her *first steps*.