### Clue: She goes on and on about trek? (7)
### Answer: RAMBLER 
 ### Explanation: Definition: She goes on and on, about trek
  Could be regarded as a double defn:  1st:  She who *goes* talking/writing *on and on*,rambles on; and 2nd:  She who strolls,rambles *on and on about*(on) the *trek*,expedition.