Long walk (4)
'long walk' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trek that I've seen before include "Long and difficult journey" , "Long hard journey on foot" , "A long hard march" , "Long difficult walk" , "Expedition or difficult trip" .)
'long walk' is the definition.
(a hike is a long walk)
This is all the clue.
(Other definitions for hike that I've seen before include "Long, hard walk" , "Tramp" , "Walking tour" , "Walk for pleasure in the country" , "Long march; increase" .)